Common Weakness Enumeration
CWE-208
AllowedObservable Timing Discrepancy
Abstraction: Base · Status: Incomplete
Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.
367 vulnerabilities reference this CWE, most recent first.
CVE-2026-41161 (GCVE-0-2026-41161)
Vulnerability from cvelistv5 – Published: 2026-05-08 13:00 – Updated: 2026-05-11 18:24
VLAI
EPSS
VEX
Title
Username Enumeration via Timing Attack
Summary
Sync-in Server is a secure, open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.2.0, the /api/auth/login endpoint contains a logic flaw that allows unauthenticated remote attackers to enumerate valid usernames by measuring the application's response time. This issue has been patched in version 2.2.0.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-11 18:23 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/Sync-in/server/security/adviso… | x_refsource_CONFIRM |
| https://github.com/Sync-in/server/releases/tag/v2.2.0 | x_refsource_MISC |
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CVE-2026-40972 (GCVE-0-2026-40972)
Vulnerability from cvelistv5 – Published: 2026-04-27 23:15 – Updated: 2026-04-29 03:55
VLAI
EPSS
VEX
Summary
An attacker on the same network as the remote application may be able to utilize a timing attack to discover information about the remote secret. In extreme circumstances this could result in the attacker determining the secret and uploading changed classes, thereby achieving remote code execution in the remote application.
Affected: Spring Boot 4.0.0–4.0.5 (fix 4.0.6), 3.5.0–3.5.13 (fix 3.5.14), 3.4.0–3.4.15 (fix 3.4.16), 3.3.0–3.3.18 (fix 3.3.19), 2.7.0–2.7.32 (fix 2.7.33); DevTools remote secret comparison. Versions that are no longer supported are also affected per vendor advisory.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-28 00:00 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Spring | Spring Boot |
Affected:
4.0.0 , < 4.0.6
(custom)
Affected: 3.5.0 , < 3.5.14 (custom) Affected: 3.4.0 , < 3.4.16 (custom) Affected: 3.3.0 , < 3.3.19 (custom) Affected: 2.7.0 , < 2.7.33 (custom) |
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CVE-2026-40263 (GCVE-0-2026-40263)
Vulnerability from cvelistv5 – Published: 2026-04-16 23:53 – Updated: 2026-04-17 12:23
VLAI
EPSS
VEX
Title
Note Mark: Username Enumeration via Login Endpoint Timing Side-Channel
Summary
Note Mark is an open-source note-taking application. In versions 0.19.1 and prior, the login endpoint performs bcrypt password verification only when the supplied username exists, returning immediately for nonexistent usernames. This timing discrepancy allows unauthenticated attackers to enumerate valid usernames by measuring response times, enabling targeted credential attacks. This issue has been fixed in version 0.19.2.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-17 12:23 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/enchant97/note-mark/security/a… | x_refsource_CONFIRM |
| https://github.com/enchant97/note-mark/commit/cf4… | x_refsource_MISC |
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CVE-2026-40194 (GCVE-0-2026-40194)
Vulnerability from cvelistv5 – Published: 2026-04-10 20:24 – Updated: 2026-05-08 15:18
VLAI
EPSS
VEX
Title
phpseclib has a variable-time HMAC comparison in SSH2::get_binary_packet() using != instead of hash_equals()
Summary
phpseclib is a PHP secure communications library. Starting in 0.1.1 and prior to 3.0.51, 2.0.53, and 1.0.28, phpseclib\Net\SSH2::get_binary_packet() uses PHP's != operator to compare a received SSH packet HMAC against the locally computed HMAC. != on equal-length binary strings in PHP uses memcmp(), which short-circuits on the first differing byte. This is a real variable-time comparison (CWE-208), proven by scaling benchmarks. This vulnerability is fixed in 3.0.51, 2.0.53, and 1.0.28.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-13 15:28 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/phpseclib/phpseclib/security/a… | x_refsource_CONFIRM |
| https://github.com/phpseclib/phpseclib/commit/ffe… | x_refsource_MISC |
| https://github.com/phpseclib/phpseclib/releases/t… | x_refsource_MISC |
| https://github.com/phpseclib/phpseclib/releases/t… | x_refsource_MISC |
| https://github.com/phpseclib/phpseclib/releases/t… | x_refsource_MISC |
Impacted products
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CVE-2026-39321 (GCVE-0-2026-39321)
Vulnerability from cvelistv5 – Published: 2026-04-07 18:11 – Updated: 2026-04-07 19:58
VLAI
EPSS
VEX
Title
Parse Server has a login timing side-channel reveals user existence
Summary
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.8.0-alpha.6 and 8.6.74, he login endpoint response time differs measurably depending on whether the submitted username or email exists in the database. When a user is not found, the server responds immediately. When a user exists but the password is wrong, a bcrypt comparison runs first, adding significant latency. This timing difference allows an unauthenticated attacker to enumerate valid usernames. This vulnerability is fixed in 9.8.0-alpha.6 and 8.6.74.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-07 18:44 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/parse-community/parse-server/s… | x_refsource_CONFIRM |
| https://github.com/parse-community/parse-server/p… | x_refsource_MISC |
| https://github.com/parse-community/parse-server/p… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| parse-community | parse-server |
Affected:
>= 9.0.0, < 9.8.0-alpha.6
Affected: < 8.6.74 |
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CVE-2026-33877 (GCVE-0-2026-33877)
Vulnerability from cvelistv5 – Published: 2026-04-15 19:11 – Updated: 2026-04-15 19:30
VLAI
EPSS
VEX
Title
ApostropheCMS: User Enumeration via Timing Side Channel in Password Reset Endpoint
Summary
ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain a timing side-channel vulnerability in the password reset endpoint (/api/v1/@apostrophecms/login/reset-request) that allows unauthenticated username and email enumeration. When a user is not found, the handler returns after a fixed 2-second artificial delay, but when a valid user is found, it performs a MongoDB update and SMTP email send with no equivalent delay normalization, producing measurably different response times. The endpoint also accepts both username and email via an $or query, and has no rate limiting as the existing checkLoginAttempts throttle only applies to the login flow. This enables automated enumeration of valid accounts for use in credential stuffing or targeted phishing. Only instances that have explicitly enabled the passwordReset option are affected, as it defaults to false. This issue has been fixed in version 4.29.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-15 19:30 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/apostrophecms/apostrophe/secur… | x_refsource_CONFIRM |
| https://github.com/apostrophecms/apostrophe/commi… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| apostrophecms | apostrophe |
Affected:
< 4.29.0
|
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CVE-2026-33129 (GCVE-0-2026-33129)
Vulnerability from cvelistv5 – Published: 2026-03-20 09:41 – Updated: 2026-03-20 19:33
VLAI
EPSS
VEX
Title
h3 has an observable timing discrepancy in basic auth utils
Summary
H3 is a minimal H(TTP) framework. Versions 2.0.1-beta.0 through 2.0.0-rc.8 contain a Timing Side-Channel vulnerability in the requireBasicAuth function due to the use of unsafe string comparison (!==). This allows an attacker to deduce the valid password character-by-character by measuring the server's response time, effectively bypassing password complexity protections. This issue is fixed in version 2.0.1-rc.9.
Severity
5.9 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-20 19:33 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/h3js/h3/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h3js/h3/pull/1283 | x_refsource_MISC |
| https://github.com/h3js/h3/releases/tag/v2.0.1-rc.9 | x_refsource_MISC |
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CVE-2026-33006 (GCVE-0-2026-33006)
Vulnerability from cvelistv5 – Published: 2026-05-04 14:42 – Updated: 2026-05-04 18:23
VLAI
EPSS
VEX
Title
Apache HTTP Server: mod_auth_digest timing attack
Summary
A timing attack against mod_auth_digest in Apache HTTP Server 2.4.66 allows a bypass of Digest authentication by a remote attacker.
Users are recommended to upgrade to version 2.4.67, which fixes this issue.
Severity
4.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-04 15:12 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://httpd.apache.org/security/vulnerabilities… | vendor-advisory |
| http://www.openwall.com/lists/oss-security/2026/0… |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server |
Affected:
0 , ≤ 2.4.66
(semver)
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CVE-2026-32935 (GCVE-0-2026-32935)
Vulnerability from cvelistv5 – Published: 2026-03-20 02:48 – Updated: 2026-05-08 15:19
VLAI
EPSS
VEX
Title
phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack
Summary
phpseclib is a PHP secure communications library. Projects using versions 0.1.1 through 1.0.26, 2.0.0 through 2.0.51, and 3.0.0 through 3.0.49 are vulnerable to a to padding oracle timing attack when using AES in CBC mode. This issue has been fixed in versions 1.0.27, 2.0.52 and 3.0.50.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-20 16:31 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/phpseclib/phpseclib/security/a… | x_refsource_CONFIRM |
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Impacted products
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CVE-2026-32702 (GCVE-0-2026-32702)
Vulnerability from cvelistv5 – Published: 2026-03-13 21:09 – Updated: 2026-03-16 16:47
VLAI
EPSS
VEX
Title
Cleanuparr has Username Enumeration via Timing Attack
Summary
Cleanuparr is a tool for automating the cleanup of unwanted or blocked files in Sonarr, Radarr, and supported download clients like qBittorrent. From 2.7.0 to 2.8.0, the /api/auth/login endpoint contains a logic flaw that allows unauthenticated remote attackers to enumerate valid usernames by measuring the application's response time. It appears that the hashing function, which is the most time-consuming part of the process by design, occurs as part of the VerifyPassword function. With the short circuits occurring before the hashing function, a timing differential is introduced that exposes validity to the actor. This vulnerability is fixed in 2.8.1.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-16 16:47 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/Cleanuparr/Cleanuparr/security… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cleanuparr | Cleanuparr |
Affected:
>= 2.7.0, <= 2.8.0
|
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No mitigation information available for this CWE.
CAPEC-462: Cross-Domain Search Timing
An attacker initiates cross domain HTTP / GET requests and times the server responses. The timing of these responses may leak important information on what is happening on the server. Browser's same origin policy prevents the attacker from directly reading the server responses (in the absence of any other weaknesses), but does not prevent the attacker from timing the responses to requests that the attacker issued cross domain.
CAPEC-541: Application Fingerprinting
An adversary engages in fingerprinting activities to determine the type or version of an application installed on a remote target.
CAPEC-580: System Footprinting
An adversary engages in active probing and exploration activities to determine security information about a remote target system. Often times adversaries will rely on remote applications that can be probed for system configurations.