Common Weakness Enumeration
CWE-434
AllowedUnrestricted Upload of File with Dangerous Type
Abstraction: Base · Status: Draft
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
5968 vulnerabilities reference this CWE, most recent first.
CVE-2021-21344 (GCVE-0-2021-21344)
Vulnerability from cvelistv5 – Published: 2021-03-22 23:40 – Updated: 2024-08-03 18:09
VLAI
EPSS
VEX
Title
XStream is vulnerable to an Arbitrary Code Execution attack
Summary
XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker to load and execute arbitrary code from a remote host only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.
Severity
5.3 (Medium)
CWE
Assigner
References
15 references
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CVE-2021-21245 (GCVE-0-2021-21245)
Vulnerability from cvelistv5 – Published: 2021-01-15 20:10 – Updated: 2024-08-03 18:09
VLAI
EPSS
VEX
Title
Pre-Auth Arbitrary File Upload
Summary
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Severity
10 (Critical)
CWE
- CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
2 references
| URL | Tags |
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| https://github.com/theonedev/onedev/security/advi… | x_refsource_CONFIRM |
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CVE-2021-21014 (GCVE-0-2021-21014)
Vulnerability from cvelistv5 – Published: 2021-02-11 20:17 – Updated: 2024-09-16 22:25
VLAI
EPSS
VEX
Title
Magento Commerce Arbitrary Folder Empty Could Lead To Arbitrary Code Execution
Summary
Magento versions 2.4.1 (and earlier), 2.4.0-p1 (and earlier) and 2.3.6 (and earlier) are vulnerable to a file upload restriction bypass. Successful exploitation could lead to arbitrary code execution by an authenticated attacker. Access to the admin console is required for successful exploitation.
Severity
9.1 (Critical)
CWE
- CWE-434 - Unrestricted Upload of File with Dangerous Type (CWE-434)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://helpx.adobe.com/security/products/magento… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Adobe | Magento Commerce |
Affected:
unspecified , ≤ 2.4.1
(custom)
Affected: unspecified , ≤ 2.4.0-p1 (custom) Affected: unspecified , ≤ 2.3.6 (custom) Affected: unspecified , ≤ None (custom) |
Date Public
2021-02-09 00:00
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CVE-2021-20022 (GCVE-0-2021-20022)
Vulnerability from cvelistv5 – Published: 2021-04-09 17:50 – Updated: 2025-10-21 23:25
VLAI
EPSS
VEX
Summary
SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to upload an arbitrary file to the remote host.
Severity
7.2 (High)
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://psirt.global.sonicwall.com/vuln-detail/SN… | x_refsource_CONFIRM |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SonicWall | Email Security |
Affected:
10.0.9 and earlier
|
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CVE-2021-4462 (GCVE-0-2021-4462)
Vulnerability from cvelistv5 – Published: 2025-11-10 22:32 – Updated: 2026-04-07 14:05 X_Known Exploited Vulnerability
VLAI
EPSS
VEX
Title
Employee Records System v1.0 Arbitrary File Upload RCE
Summary
Employee Records System version 1.0 contains an unrestricted file upload vulnerability that allows a remote unauthenticated attacker to upload arbitrary files via the uploadID.php endpoint; uploaded files can be executed because the application does not perform proper server-side validation. Exploitation evidence was observed by the Shadowserver Foundation on 2025-02-06 UTC.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://www.sourcecodester.com/php/11393/employee… | product |
| https://www.exploit-db.com/exploits/49596 | exploit |
| https://www.vulncheck.com/advisories/employees-re… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Employee Records System | Employee Records System |
Affected:
1.0
|
Date Public
2021-02-26 00:00
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CVE-2021-4455 (GCVE-0-2021-4455)
Vulnerability from cvelistv5 – Published: 2025-04-19 07:23 – Updated: 2026-04-08 16:40
VLAI
EPSS
VEX
Title
Wordpress Plugin Smart Product Review <= 1.0.4 - Unauthenticated Arbitrary File Upload
Summary
The Wordpress Plugin Smart Product Review plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in all versions up to, and including, 1.0.4. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Codeflist | Wordpress Plugin Smart Product Review |
Affected:
0 , ≤ 1.0.4
(semver)
|
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CVE-2021-4449 (GCVE-0-2021-4449)
Vulnerability from cvelistv5 – Published: 2024-10-16 06:43 – Updated: 2026-04-08 16:42
VLAI
EPSS
VEX
Title
ZoomSounds <= 5.96 - Unauthenticated Arbitrary File Upload
Summary
The ZoomSounds plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'savepng.php' file in versions up to, and including, 5.96. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible. CVE-2021-4457 is a duplicate of this.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| ZoomIt | ZoomSounds - WordPress Wave Audio Player with Playlist |
Affected:
0 , ≤ 5.96
(semver)
|
|
| zoomit | zoomsounds |
Affected:
0 , ≤ 5.96
(custom)
cpe:2.3:a:zoomit:zoomsounds:*:*:*:*:*:*:*:* |
Credits
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CVE-2021-4443 (GCVE-0-2021-4443)
Vulnerability from cvelistv5 – Published: 2024-10-16 06:43 – Updated: 2026-04-08 16:33
VLAI
EPSS
VEX
Title
WordPress Mega Menu <= 2.0.6 - Arbitrary File Creation
Summary
The WordPress Mega Menu plugin for WordPress is vulnerable to Arbitrary File Creation in versions up to, and including, 2.0.6 via the compiler_save AJAX action. This makes it possible for unauthenticated attackers to create arbitrary PHP files that can be used to execute malicious code.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| quadlayers | QuadMenu – Mega Menu |
Affected:
0 , ≤ 2.0.6
(semver)
|
|
| quadlayers | wordpress_mega_menu-quadmenu |
Affected:
0 , ≤ 2.0.6
(custom)
cpe:2.3:a:quadlayers:wordpress_mega_menu-quadmenu:*:*:*:*:*:*:*:* |
Credits
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CVE-2021-4382 (GCVE-0-2021-4382)
Vulnerability from cvelistv5 – Published: 2023-06-07 01:51 – Updated: 2026-04-08 17:33
VLAI
EPSS
VEX
Title
Recently <= 3.0.4 - Arbitrary File Upload to Remote Code Exectution
Summary
The Recently plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the fetch_external_image() function in versions up to, and including, 3.0.4. This makes it possible for authenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Credits
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CVE-2021-4354 (GCVE-0-2021-4354)
Vulnerability from cvelistv5 – Published: 2023-06-07 01:51 – Updated: 2026-04-08 16:56
VLAI
EPSS
VEX
Title
PWA for WP & AMP <= 1.7.32 - Arbitrary File Upload
Summary
The PWA for WP & AMP for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the pwaforwp_splashscreen_uploader function in versions up to, and including, 1.7.32. This makes it possible for authenticated attackers to upload arbitrary files on the affected sites server which may make remote code execution possible.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| magazine3 | PWA for WP – Progressive Web Apps Made Simple |
Affected:
0 , ≤ 1.7.32
(semver)
|
Credits
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Mitigation
Architecture and Design
Generate a new, unique filename for an uploaded file instead of using the user-supplied filename, so that no external input is used at all.[REF-422] [REF-423]
Mitigation MIT-21
Architecture and Design
Strategy: Enforcement by Conversion
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.
Mitigation
Architecture and Design
Consider storing the uploaded files outside of the web document root entirely. Then, use other mechanisms to deliver the files dynamically. [REF-423]
Mitigation MIT-5
Implementation
Strategy: Input Validation
- 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.
- For example, limiting filenames to alphanumeric characters can help to restrict the introduction of unintended file extensions.
Mitigation
Architecture and Design
Define a very limited set of allowable extensions and only generate filenames that end in these extensions. Consider the possibility of XSS (CWE-79) before allowing .html or .htm file types.
Mitigation
Implementation
Strategy: Input Validation
Ensure that only one extension is used in the filename. Some web servers, including some versions of Apache, may process files based on inner extensions so that "filename.php.gif" is fed to the PHP interpreter.[REF-422] [REF-423]
Mitigation
Implementation
When running on a web server that supports case-insensitive filenames, perform case-insensitive evaluations of the extensions that are provided.
Mitigation MIT-15
Architecture and Design
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
Implementation
Do not rely exclusively on sanity checks of file contents to ensure that the file is of the expected type and size. It may be possible for an attacker to hide code in some file segments that will still be executed by the server. For example, GIF images may contain a free-form comments field.
Mitigation
Implementation
Do not rely exclusively on the MIME content type or filename attribute when determining how to render a file. Validating the MIME content type and ensuring that it matches the extension is only a partial solution.
Mitigation MIT-17
Architecture and Design
Operation
Strategy: Environment Hardening
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 MIT-22
Architecture and Design
Operation
Strategy: Sandbox or Jail
- 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.
CAPEC-1: Accessing Functionality Not Properly Constrained by ACLs
In applications, particularly web applications, access to functionality is mitigated by an authorization framework. This framework maps Access Control Lists (ACLs) to elements of the application's functionality; particularly URL's for web apps. In the case that the administrator failed to specify an ACL for a particular element, an attacker may be able to access it with impunity. An attacker with the ability to access functionality not properly constrained by ACLs can obtain sensitive information and possibly compromise the entire application. Such an attacker can access resources that must be available only to users at a higher privilege level, can access management sections of the application, or can run queries for data that they otherwise not supposed to.