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CWE-22
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
CVE-2026-34726 (GCVE-0-2026-34726)
Vulnerability from cvelistv5 – Published: 2026-04-02 18:07 – Updated: 2026-04-03 16:16
VLAI
Title
Copier `_subdirectory` allows template root escape via parent-directory traversal
Summary
Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _subdirectory setting is documented as the subdirectory to use as the template root. However, the current implementation accepts parent-directory traversal such as .. and uses it directly when selecting the template root. As a result, a template can escape its own directory and make Copier render files from the parent directory without --UNSAFE. This issue has been patched in version 9.14.1.
Severity
4.4 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/copier-org/copier/security/adv… | x_refsource_CONFIRM |
| https://github.com/copier-org/copier/commit/cb80a… | x_refsource_MISC |
| https://github.com/copier-org/copier/releases/tag… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| copier-org | copier |
Affected:
< 9.14.1
|
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CVE-2026-34728 (GCVE-0-2026-34728)
Vulnerability from cvelistv5 – Published: 2026-04-02 14:44 – Updated: 2026-04-02 15:24
VLAI
Title
phpMyFAQ: Path Traversal - Arbitrary File Deletion in MediaBrowserController
Summary
phpMyFAQ is an open source FAQ web application. Prior to version 4.1.1, the MediaBrowserController::index() method handles file deletion for the media browser. When the fileRemove action is triggered, the user-supplied name parameter is concatenated with the base upload directory path without any path traversal validation. The FILTER_SANITIZE_SPECIAL_CHARS filter only encodes HTML special characters (&, ', ", <, >) and characters with ASCII value < 32, and does not prevent directory traversal sequences like ../. Additionally, the endpoint does not validate CSRF tokens, making it exploitable via CSRF attacks. This issue has been patched in version 4.1.1.
Severity
8.7 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/thorsten/phpMyFAQ/security/adv… | x_refsource_CONFIRM |
| https://github.com/thorsten/phpMyFAQ/releases/tag/4.1.1 | x_refsource_MISC |
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CVE-2026-34730 (GCVE-0-2026-34730)
Vulnerability from cvelistv5 – Published: 2026-04-02 18:09 – Updated: 2026-04-03 13:01
VLAI
Title
Copier `_external_data` allows path traversal and absolute-path local file read without unsafe mode
Summary
Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _external_data feature allows a template to load YAML files using template-controlled paths. If untrusted templates are in scope, a malicious template can read attacker-chosen YAML-parseable local files that are accessible to the user running Copier and expose their contents in rendered output. This issue has been patched in version 9.14.1.
Severity
5.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/copier-org/copier/security/adv… | x_refsource_CONFIRM |
| https://github.com/copier-org/copier/commit/54130… | x_refsource_MISC |
| https://github.com/copier-org/copier/releases/tag… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| copier-org | copier |
Affected:
< 9.14.1
|
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CVE-2026-3474 (GCVE-0-2026-3474)
Vulnerability from cvelistv5 – Published: 2026-03-20 23:25 – Updated: 2026-04-08 17:26
VLAI
Title
EmailKit <= 1.6.3 - Authenticated (Administrator+) Path Traversal via 'emailkit-editor-template' REST API Parameter
Summary
The EmailKit – Email Customizer for WooCommerce & WP plugin for WordPress is vulnerable to arbitrary file read via path traversal in all versions up to, and including, 1.6.3. This is due to the action() function in the TemplateData class passing user-supplied input from the 'emailkit-editor-template' REST API parameter directly to file_get_contents() without any path validation, sanitization, or restriction to an allowed directory. This makes it possible for authenticated attackers, with Administrator-level access, to read arbitrary files on the server (such as /etc/passwd or wp-config.php) by supplying a traversal path. The file contents are stored as post meta and can subsequently be retrieved via the fetch-data REST API endpoint. Notably, the CheckForm class in the same plugin implements proper path validation using realpath() and directory restriction, demonstrating that the developer was aware of the risk but failed to apply the same protections to the TemplateData endpoint.
Severity
4.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
8 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| roxnor | EmailKit – Email Customizer for WooCommerce & WP |
Affected:
0 , ≤ 1.6.3
(semver)
|
Credits
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CVE-2026-34745 (GCVE-0-2026-34745)
Vulnerability from cvelistv5 – Published: 2026-04-02 18:38 – Updated: 2026-04-02 19:15
VLAI
Title
Unauthenticated Path Traversal Arbitrary File Write in /api/uploadChunked/public
Summary
Fireshare facilitates self-hosted media and link sharing. Prior to version 1.5.3, the fix for CVE-2026-33645 was applied to the authenticated /api/uploadChunked endpoint but was not applied to the unauthenticated /api/uploadChunked/public endpoint in the same file (app/server/fireshare/api.py). An unauthenticated attacker can exploit the checkSum parameter to write arbitrary files with attacker-controlled content to any writable path on the server filesystem. This issue has been patched in version 1.5.3.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ShaneIsrael/fireshare/security… | x_refsource_CONFIRM |
| https://github.com/ShaneIsrael/fireshare/pull/520 | x_refsource_MISC |
| https://github.com/ShaneIsrael/fireshare/commit/b… | x_refsource_MISC |
| https://github.com/ShaneIsrael/fireshare/releases… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ShaneIsrael | fireshare |
Affected:
< 1.5.3
|
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CVE-2026-34750 (GCVE-0-2026-34750)
Vulnerability from cvelistv5 – Published: 2026-04-01 19:51 – Updated: 2026-04-02 15:33
VLAI
Title
Payload has Insufficient Filename Validation in Client-Upload Signed-URL Endpoints
Summary
Payload is a free and open source headless content management system. Prior to version 3.78.0 in @payloadcms/storage-azure, @payloadcms/storage-gcs, @payloadcms/storage-r2, and @payloadcms/storage-s3, the client-upload signed-URL endpoints for S3, GCS, Azure, and R2 did not properly sanitize filenames. An attacker could craft filenames to escape the intended storage location. This issue has been patched in version 3.78.0 for @payloadcms/storage-azure, @payloadcms/storage-gcs, @payloadcms/storage-r2, and @payloadcms/storage-s3.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/payloadcms/payload/security/ad… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| payloadcms | payload |
Affected:
< 3.78.0
|
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CVE-2026-34783 (GCVE-0-2026-34783)
Vulnerability from cvelistv5 – Published: 2026-04-06 16:04 – Updated: 2026-04-07 14:12
VLAI
Title
Ferret has a Path Traversal in IO::FS::WRITE allows arbitrary file write when scraping malicious websites
Summary
Ferret is a declarative system for working with web data. Prior to 2.0.0-alpha.4, a path traversal vulnerability in Ferret's IO::FS::WRITE standard library function allows a malicious website to write arbitrary files to the filesystem of the machine running Ferret. When an operator scrapes a website that returns filenames containing ../ sequences, and uses those filenames to construct output paths (a standard scraping pattern), the attacker controls both the destination path and the file content. This can lead to remote code execution via cron jobs, SSH authorized_keys, shell profiles, or web shells. This vulnerability is fixed in 2.0.0-alpha.4.
Severity
8.1 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/MontFerret/ferret/security/adv… | x_refsource_CONFIRM |
| https://github.com/MontFerret/ferret/commit/160eb… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MontFerret | ferret |
Affected:
< 2.0.0-alpha.4
|
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CVE-2026-34790 (GCVE-0-2026-34790)
Vulnerability from cvelistv5 – Published: 2026-04-02 14:45 – Updated: 2026-05-25 23:42 X_Open Source
VLAI
Title
Endian Firewall /cgi-bin/backup.cgi remove ARCHIVE Directory Traversal
Summary
Endian Firewall version 3.3.25 and prior allow authenticated users to delete arbitrary files via directory traversal in the remove ARCHIVE parameter to /cgi-bin/backup.cgi. The remove ARCHIVE parameter value is used to construct a file path without sanitization of directory traversal sequences, which is then passed to an unlink() call.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://help.endian.com/hc/en-us/sections/3600043… | release-notes |
| https://www.vulncheck.com/advisories/endian-firew… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Endian | Endian Firewall |
Affected:
0 , ≤ 3.3.25
(semver)
|
Date Public
2025-12-03 00:00
Credits
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CVE-2026-34909 (GCVE-0-2026-34909)
Vulnerability from cvelistv5 – Published: 2026-05-22 00:43 – Updated: 2026-06-24 03:56
VLAI
Summary
A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to access an underlying account.
Severity
10 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Path Traversal
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://community.ui.com/releases/Security-Adviso… | |
| https://www.pwndefend.com/2026/06/09/cve-2026-349… | third-party-advisory |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
32 products
| Vendor | Product | Version | |
|---|---|---|---|
| Ubiquiti Inc | UniFi OS Server |
Affected:
0 , < 5.0.8
(semver)
|
|
| Ubiquiti Inc | Express |
Affected:
0 , < 4.0.14
(semver)
|
|
| Ubiquiti Inc | UDM |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDM-Pro |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDM-SE |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDM-Pro-Max |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDM-Beast |
Affected:
0 , < 5.1.11
(semver)
|
|
| Ubiquiti Inc | EFG |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDW |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDR |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDR7 |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDR-5G |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | Express 7 |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNVR |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNVR-Pro |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNVR-Instant |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNVR-G2 |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNVR-G2-Pro |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | ENVR |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | ENVR-Core |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNAS-2 |
Affected:
0 , < 5.1.10
(semver)
|
|
| Ubiquiti Inc | UNAS-4 |
Affected:
0 , < 5.1.10
(semver)
|
|
| Ubiquiti Inc | UNAS-Pro |
Affected:
0 , < 5.1.10
(semver)
|
|
| Ubiquiti Inc | UNAS-Pro-4 |
Affected:
0 , < 5.1.10
(semver)
|
|
| Ubiquiti Inc | UNAS-Pro-8 |
Affected:
0 , < 5.1.10
(semver)
|
|
| Ubiquiti Inc | UCKP |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCK |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCK-Enterprise |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCG-Ultra |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCG-Max |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCG-Fiber |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCG-Industrial |
Affected:
0 , < 5.1.12
(semver)
|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
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{
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{
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"versions": [
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"version": "0",
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},
{
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"product": "EFG",
"vendor": "Ubiquiti Inc",
"versions": [
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"version": "0",
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},
{
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"vendor": "Ubiquiti Inc",
"versions": [
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"version": "0",
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},
{
"defaultStatus": "unaffected",
"product": "UDR",
"vendor": "Ubiquiti Inc",
"versions": [
{
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"status": "affected",
"version": "0",
"versionType": "semver"
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]
},
{
"defaultStatus": "unaffected",
"product": "UDR7",
"vendor": "Ubiquiti Inc",
"versions": [
{
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"status": "affected",
"version": "0",
"versionType": "semver"
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]
},
{
"defaultStatus": "unaffected",
"product": "UDR-5G",
"vendor": "Ubiquiti Inc",
"versions": [
{
"lessThan": "5.1.12",
"status": "affected",
"version": "0",
"versionType": "semver"
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]
},
{
"defaultStatus": "unaffected",
"product": "Express 7",
"vendor": "Ubiquiti Inc",
"versions": [
{
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"status": "affected",
"version": "0",
"versionType": "semver"
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]
},
{
"defaultStatus": "unaffected",
"product": "UNVR",
"vendor": "Ubiquiti Inc",
"versions": [
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"version": "0",
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{
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},
{
"defaultStatus": "unaffected",
"product": "UNVR-Instant",
"vendor": "Ubiquiti Inc",
"versions": [
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"status": "affected",
"version": "0",
"versionType": "semver"
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]
},
{
"defaultStatus": "unaffected",
"product": "UNVR-G2",
"vendor": "Ubiquiti Inc",
"versions": [
{
"lessThan": "5.1.12",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
},
{
"defaultStatus": "unaffected",
"product": "UNVR-G2-Pro",
"vendor": "Ubiquiti Inc",
"versions": [
{
"lessThan": "5.1.12",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
},
{
"defaultStatus": "unaffected",
"product": "ENVR",
"vendor": "Ubiquiti Inc",
"versions": [
{
"lessThan": "5.1.12",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
},
{
"defaultStatus": "unaffected",
"product": "ENVR-Core",
"vendor": "Ubiquiti Inc",
"versions": [
{
"lessThan": "5.1.12",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
},
{
"defaultStatus": "unaffected",
"product": "UNAS-2",
"vendor": "Ubiquiti Inc",
"versions": [
{
"lessThan": "5.1.10",
"status": "affected",
"version": "0",
"versionType": "semver"
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]
},
{
"defaultStatus": "unaffected",
"product": "UNAS-4",
"vendor": "Ubiquiti Inc",
"versions": [
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"status": "affected",
"version": "0",
"versionType": "semver"
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},
{
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"vendor": "Ubiquiti Inc",
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"version": "0",
"versionType": "semver"
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"product": "UNAS-Pro-4",
"vendor": "Ubiquiti Inc",
"versions": [
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"status": "affected",
"version": "0",
"versionType": "semver"
}
]
},
{
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"product": "UNAS-Pro-8",
"vendor": "Ubiquiti Inc",
"versions": [
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"status": "affected",
"version": "0",
"versionType": "semver"
}
]
},
{
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"product": "UCKP",
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"versions": [
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"version": "0",
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}
]
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{
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},
"cveMetadata": {
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"datePublished": "2026-05-22T00:43:49.072Z",
"dateReserved": "2026-03-31T15:00:06.521Z",
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}
CVE-2026-34911 (GCVE-0-2026-34911)
Vulnerability from cvelistv5 – Published: 2026-05-22 00:43 – Updated: 2026-05-22 12:37
VLAI
Summary
A malicious actor with access to the network and low privileges could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to obtain sensitive information.
Severity
7.7 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Path Traversal
Assigner
References
1 reference
Impacted products
31 products
| Vendor | Product | Version | |
|---|---|---|---|
| Ubiquiti Inc | UniFi OS Server |
Affected:
0 , < 5.0.8
(semver)
|
|
| Ubiquiti Inc | UDM |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDM-Pro |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDM-SE |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDM-Pro-Max |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDM-Beast |
Affected:
0 , < 5.1.11
(semver)
|
|
| Ubiquiti Inc | EFG |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDW |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDR |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDR7 |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UDR-5G |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | Express 7 |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNVR |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNVR-Pro |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNVR-Instant |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNVR-G2 |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNVR-G2-Pro |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | ENVR |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | ENVR-Core |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UNAS-2 |
Affected:
0 , < 5.1.10
(semver)
|
|
| Ubiquiti Inc | UNAS-4 |
Affected:
0 , < 5.1.10
(semver)
|
|
| Ubiquiti Inc | UNAS-Pro |
Affected:
0 , < 5.1.10
(semver)
|
|
| Ubiquiti Inc | UNAS-Pro-4 |
Affected:
0 , < 5.1.10
(semver)
|
|
| Ubiquiti Inc | UNAS-Pro-8 |
Affected:
0 , < 5.1.10
(semver)
|
|
| Ubiquiti Inc | UCKP |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCK |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCK-Enterprise |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCG-Ultra |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCG-Max |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCG-Fiber |
Affected:
0 , < 5.1.12
(semver)
|
|
| Ubiquiti Inc | UCG-Industrial |
Affected:
0 , < 5.1.12
(semver)
|
{
"containers": {
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{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-34911",
"options": [
{
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{
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],
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"timestamp": "2026-05-22T12:37:38.876728Z",
"version": "2.0.3"
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"providerMetadata": {
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},
"title": "CISA ADP Vulnrichment"
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"product": "UDM-SE",
"vendor": "Ubiquiti Inc",
"versions": [
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"status": "affected",
"version": "0",
"versionType": "semver"
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{
"defaultStatus": "unaffected",
"product": "UDM-Pro-Max",
"vendor": "Ubiquiti Inc",
"versions": [
{
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"status": "affected",
"version": "0",
"versionType": "semver"
}
]
},
{
"defaultStatus": "unaffected",
"product": "UDM-Beast",
"vendor": "Ubiquiti Inc",
"versions": [
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"status": "affected",
"version": "0",
"versionType": "semver"
}
]
},
{
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"product": "EFG",
"vendor": "Ubiquiti Inc",
"versions": [
{
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"status": "affected",
"version": "0",
"versionType": "semver"
}
]
},
{
"defaultStatus": "unaffected",
"product": "UDW",
"vendor": "Ubiquiti Inc",
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"descriptions": [
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"lang": "en",
"value": "A malicious actor with access to the network and low privileges could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to obtain sensitive information."
}
],
"metrics": [
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"cvssV3_1": {
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"orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
"shortName": "hackerone"
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"url": "https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b"
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"datePublished": "2026-05-22T00:43:49.189Z",
"dateReserved": "2026-03-31T15:00:06.521Z",
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Mitigation ID: MIT-5.1
Phase: Implementation
Strategy: Input Validation
Description:
- Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
- When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
- Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
- When validating filenames, use stringent allowlists that limit the character set to be used. If feasible, only allow a single "." character in the filename to avoid weaknesses such as CWE-23, and exclude directory separators such as "/" to avoid CWE-36. Use a list of allowable file extensions, which will help to avoid CWE-434.
- Do not rely exclusively on a filtering mechanism that removes potentially dangerous characters. This is equivalent to a denylist, which may be incomplete (CWE-184). For example, filtering "/" is insufficient protection if the filesystem also supports the use of "\" as a directory separator. Another possible error could occur when the filtering is applied in a way that still produces dangerous data (CWE-182). For example, if "../" sequences are removed from the ".../...//" string in a sequential fashion, two instances of "../" would be removed from the original string, but the remaining characters would still form the "../" string.
Mitigation ID: MIT-15
Phase: Architecture and Design
Description:
- For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
Mitigation ID: MIT-20.1
Phase: Implementation
Strategy: Input Validation
Description:
- Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.
- Use a built-in path canonicalization function (such as realpath() in C) that produces the canonical version of the pathname, which effectively removes ".." sequences and symbolic links (CWE-23, CWE-59). This includes:
- realpath() in C
- getCanonicalPath() in Java
- GetFullPath() in ASP.NET
- realpath() or abs_path() in Perl
- realpath() in PHP
Mitigation ID: MIT-4
Phase: Architecture and Design
Strategy: Libraries or Frameworks
Description:
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].
Mitigation ID: MIT-29
Phase: Operation
Strategy: Firewall
Description:
- Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].
Mitigation ID: MIT-17
Phases: Architecture and Design, Operation
Strategy: Environment Hardening
Description:
- Run your code using the lowest privileges that are required to accomplish the necessary tasks [REF-76]. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.
Mitigation ID: MIT-21.1
Phase: Architecture and Design
Strategy: Enforcement by Conversion
Description:
- When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
- For example, ID 1 could map to "inbox.txt" and ID 2 could map to "profile.txt". Features such as the ESAPI AccessReferenceMap [REF-185] provide this capability.
Mitigation ID: MIT-22
Phases: Architecture and Design, Operation
Strategy: Sandbox or Jail
Description:
- Run the code in a "jail" or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which files can be accessed in a particular directory or which commands can be executed by the software.
- OS-level examples include the Unix chroot jail, AppArmor, and SELinux. In general, managed code may provide some protection. For example, java.io.FilePermission in the Java SecurityManager allows the software to specify restrictions on file operations.
- This may not be a feasible solution, and it only limits the impact to the operating system; the rest of the application may still be subject to compromise.
- Be careful to avoid CWE-243 and other weaknesses related to jails.
Mitigation ID: MIT-34
Phases: Architecture and Design, Operation
Strategy: Attack Surface Reduction
Description:
- Store library, include, and utility files outside of the web document root, if possible. Otherwise, store them in a separate directory and use the web server's access control capabilities to prevent attackers from directly requesting them. One common practice is to define a fixed constant in each calling program, then check for the existence of the constant in the library/include file; if the constant does not exist, then the file was directly requested, and it can exit immediately.
- This significantly reduces the chance of an attacker being able to bypass any protection mechanisms that are in the base program but not in the include files. It will also reduce the attack surface.
Mitigation ID: MIT-39
Phase: Implementation
Description:
- Ensure that error messages only contain minimal details that are useful to the intended audience and no one else. The messages need to strike the balance between being too cryptic (which can confuse users) or being too detailed (which may reveal more than intended). The messages should not reveal the methods that were used to determine the error. Attackers can use detailed information to refine or optimize their original attack, thereby increasing their chances of success.
- If errors must be captured in some detail, record them in log messages, but consider what could occur if the log messages can be viewed by attackers. Highly sensitive information such as passwords should never be saved to log files.
- Avoid inconsistent messaging that might accidentally tip off an attacker about internal state, such as whether a user account exists or not.
- In the context of path traversal, error messages which disclose path information can help attackers craft the appropriate attack strings to move through the file system hierarchy.
Mitigation ID: MIT-16
Phases: Operation, Implementation
Strategy: Environment Hardening
Description:
- When using PHP, configure the application so that it does not use register_globals. During implementation, develop the application so that it does not rely on this feature, but be wary of implementing a register_globals emulation that is subject to weaknesses such as CWE-95, CWE-621, and similar issues.
CAPEC-126: Path Traversal
An adversary uses path manipulation methods to exploit insufficient input validation of a target to obtain access to data that should be not be retrievable by ordinary well-formed requests. A typical variety of this attack involves specifying a path to a desired file together with dot-dot-slash characters, resulting in the file access API or function traversing out of the intended directory structure and into the root file system. By replacing or modifying the expected path information the access function or API retrieves the file desired by the attacker. These attacks either involve the attacker providing a complete path to a targeted file or using control characters (e.g. path separators (/ or \) and/or dots (.)) to reach desired directories or files.
CAPEC-64: Using Slashes and URL Encoding Combined to Bypass Validation Logic
This attack targets the encoding of the URL combined with the encoding of the slash characters. An attacker can take advantage of the multiple ways of encoding a URL and abuse the interpretation of the URL. A URL may contain special character that need special syntax handling in order to be interpreted. Special characters are represented using a percentage character followed by two digits representing the octet code of the original character (%HEX-CODE). For instance US-ASCII space character would be represented with %20. This is often referred as escaped ending or percent-encoding. Since the server decodes the URL from the requests, it may restrict the access to some URL paths by validating and filtering out the URL requests it received. An attacker will try to craft an URL with a sequence of special characters which once interpreted by the server will be equivalent to a forbidden URL. It can be difficult to protect against this attack since the URL can contain other format of encoding such as UTF-8 encoding, Unicode-encoding, etc.
CAPEC-76: Manipulating Web Input to File System Calls
An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.
CAPEC-78: Using Escaped Slashes in Alternate Encoding
This attack targets the use of the backslash in alternate encoding. An adversary can provide a backslash as a leading character and causes a parser to believe that the next character is special. This is called an escape. By using that trick, the adversary tries to exploit alternate ways to encode the same character which leads to filter problems and opens avenues to attack.
CAPEC-79: Using Slashes in Alternate Encoding
This attack targets the encoding of the Slash characters. An adversary would try to exploit common filtering problems related to the use of the slashes characters to gain access to resources on the target host. Directory-driven systems, such as file systems and databases, typically use the slash character to indicate traversal between directories or other container components. For murky historical reasons, PCs (and, as a result, Microsoft OSs) choose to use a backslash, whereas the UNIX world typically makes use of the forward slash. The schizophrenic result is that many MS-based systems are required to understand both forms of the slash. This gives the adversary many opportunities to discover and abuse a number of common filtering problems. The goal of this pattern is to discover server software that only applies filters to one version, but not the other.