Common Weakness Enumeration
CWE-204
AllowedObservable Response Discrepancy
Abstraction: Base · Status: Incomplete
The product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere.
326 vulnerabilities reference this CWE, most recent first.
CVE-2026-4045 (GCVE-0-2026-4045)
Vulnerability from cvelistv5 – Published: 2026-03-12 16:02 – Updated: 2026-03-12 16:51
VLAI
EPSS
VEX
Title
projectsend Auth.php response discrepancy
Summary
A flaw has been found in projectsend up to r1945. This impacts an unknown function of the file includes/Classes/Auth.php. Executing a manipulation of the argument ldap_email can lead to observable response discrepancy. The attack can be executed remotely. A high complexity level is associated with this attack. The exploitability is said to be difficult. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-12 16:50 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.350657 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.350657 | signaturepermissions-required |
| https://vuldb.com/?submit.769577 | third-party-advisory |
| https://drive.google.com/file/d/1TNwWNTcra2ykx0yX… | exploit |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | projectsend |
Affected:
r1945
cpe:2.3:a:projectsend:projectsend:*:*:*:*:*:*:*:* |
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CVE-2026-2859 (GCVE-0-2026-2859)
Vulnerability from cvelistv5 – Published: 2026-03-13 09:40 – Updated: 2026-03-13 15:48
VLAI
EPSS
VEX
Title
Unauthenticated Host Enumeration via Observable Response Discrepancy on Deploy Agent Endpoint
Summary
Improper permission enforcement in Checkmk versions 2.4.0 before 2.4.0p23, 2.3.0 before 2.3.0p43, and 2.2.0 (EOL) allows unauthenticated users to enumerate existing hosts by observing different HTTP response codes in deploy_agent endpoint, which could lead to information disclosure.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-13 15:48 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://checkmk.com/werk/18994 |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Checkmk GmbH | Checkmk |
Affected:
2.4.0 , < 2.4.0p23
(semver)
Affected: 2.3.0 , < 2.3.0p43 (semver) Affected: 2.2.0 (semver) cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:* cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:* cpe:2.3:a:checkmk:checkmk:2.2.0:*:*:*:*:*:*:* |
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CVE-2025-69413 (GCVE-0-2025-69413)
Vulnerability from cvelistv5 – Published: 2026-01-01 04:39 – Updated: 2026-01-05 19:56
VLAI
EPSS
VEX
Summary
In Gitea before 1.25.2, /api/v1/user has different responses for failed authentication depending on whether a username exists.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-05 19:55 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
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CVE-2025-69243 (GCVE-0-2025-69243)
Vulnerability from cvelistv5 – Published: 2026-03-16 11:54 – Updated: 2026-03-16 13:49 X_Open Source
VLAI
EPSS
VEX
Title
User enumeration in Raytha CMS
Summary
Raytha CMS is vulnerable to User Enumeration in password reset functionality. Difference in messages could allow an attacker to determine if the login is valid or not, enabling a brute force attack with valid logins.
This issue was fixed in version 1.5.0.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-16 13:38 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://cert.pl/en/posts/2026/03/CVE-2025-69236 | third-party-advisory |
| https://raytha.com | product |
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CVE-2025-67874 (GCVE-0-2025-67874)
Vulnerability from cvelistv5 – Published: 2025-12-16 00:44 – Updated: 2025-12-16 20:06
VLAI
EPSS
VEX
Title
ChurchCRM has plaintext password return in response
Summary
ChurchCRM is an open-source church management system. Prior to version 6.5.0, the application echoes back plaintext passwords submitted by users in subsequent HTTP responses. This information disclosure significantly increases the risk of credential compromise and may amplify the impact of other vulnerabilities (e.g., XSS, IDOR, session fixation), enabling attackers to harvest other users’ passwords. Version 6.5.0 fixes the issue.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-16 20:06 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/ChurchCRM/CRM/security/advisor… | x_refsource_CONFIRM |
| https://github.com/ChurchCRM/CRM/commit/2d6cf7aed… | x_refsource_MISC |
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CVE-2025-67500 (GCVE-0-2025-67500)
Vulnerability from cvelistv5 – Published: 2025-12-09 23:44 – Updated: 2026-01-08 15:18
VLAI
EPSS
VEX
Title
Mastodon Error Handling Discrepancy Enables Private Status Existence Enumeration
Summary
Mastodon is a free, open-source social network server based on ActivityPub. Versions 4.2.27 and prior, 4.3.0-beta.1 through 4.3.14, 4.4.0-beta.1 through 4.4.9, 4.5.0-beta.1 through 4.5.2 have discrepancies in error handling which allow checking whether a given status exists by sending a request with a non-English Accept-Language header. Using this behavior, an attacker who knows the identifier of a particular status they are not allowed to see can confirm whether this status exists or not. This cannot be used to learn the contents of the status or any other property besides its existence. This issue is fixed in versions 4.2.28, 4.3.15, 4.4.10 and 4.5.3.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-10 15:42 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/mastodon/mastodon/security/adv… | x_refsource_CONFIRM |
| https://github.com/mastodon/mastodon/pull/37077/c… | x_refsource_MISC |
Impacted products
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CVE-2025-66307 (GCVE-0-2025-66307)
Vulnerability from cvelistv5 – Published: 2025-12-01 21:53 – Updated: 2025-12-02 20:07
VLAI
EPSS
VEX
Title
Grav Admin Plugin vulnerable to User Enumeration & Email Disclosure
Summary
This admin plugin for Grav is an HTML user interface that provides a convenient way to configure Grav and easily create and modify pages. Prior to 1.11.0-beta.1, a user enumeration and email disclosure vulnerability exists in Grav. The "Forgot Password" functionality at /admin/forgot leaks information about valid usernames and their associated email addresses through distinct server responses. This allows an attacker to enumerate users and disclose sensitive email addresses, which can be leveraged for targeted attacks such as password spraying, phishing, or social engineering. This vulnerability is fixed in 1.11.0-beta.1.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-02 20:07 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/getgrav/grav/security/advisori… | x_refsource_CONFIRM |
| https://github.com/getgrav/grav-plugin-admin/comm… | x_refsource_MISC |
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CVE-2025-62512 (GCVE-0-2025-62512)
Vulnerability from cvelistv5 – Published: 2026-02-24 16:43 – Updated: 2026-02-27 20:52
VLAI
EPSS
VEX
Title
Piwigo Vulnerable to User Enumeration via Password Reset Endpoint
Summary
Piwigo is an open source photo gallery application for the web. In version 15.5.0 and likely earlier 15.x releases, the password reset functionality in Piwigo allows an unauthenticated attacker to determine whether a given username or email address exists in the system. The endpoint at password.php?action=lost returns distinct messages for valid vs. invalid accounts, enabling user enumeration. As of time of publication, no known patches are available.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-27 20:52 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/Piwigo/Piwigo/security/advisor… | x_refsource_CONFIRM |
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CVE-2025-62236 (GCVE-0-2025-62236)
Vulnerability from cvelistv5 – Published: 2025-10-23 19:31 – Updated: 2025-10-27 13:45 Exclusively Hosted Service
VLAI
EPSS
VEX
Title
Frontier Airlines publicly available email address validation
Summary
The Frontier Airlines website has a publicly available endpoint that validates if an email addresses is associated with an account. An unauthenticated, remote attacker could determine valid email addresses, possibly aiding in further attacks.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · cisa-cg (v2.0.3)
Decision recorded 2025-10-06 16:51 UTC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-27 13:44 UTC
CWE
- CWE-204 - Observable Response Discrepancy
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Frontier Airlines | flyfrontier.com |
Affected:
*
|
Date Public
2025-10-23 00:00
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CVE-2025-62181 (GCVE-0-2025-62181)
Vulnerability from cvelistv5 – Published: 2025-12-10 20:41 – Updated: 2025-12-11 15:32
VLAI
EPSS
VEX
Title
Pega Platform versions 7.1.0 through Infinity 25.1.0 are affected by a User Enumeration where during user authentication process, a difference in response time could allow a remote unauthenticated user to determine if a username is valid or not.
Summary
Pega Platform versions 7.1.0 through Infinity 25.1.0 are affected by a User Enumeration. This issue occurs during user authentication process, where a difference in response time could allow a remote unauthenticated user to determine if a username is valid or not. This only applies to deprecated basic-authentication feature and other more secure authentication mechanisms are recommended. A fix is being provided in the 24.1.4, 24.2.4, and 25.1.1 patch releases. Please note: Basic credentials authentication service type is deprecated started in 24.2 version: https://docs.pega.com/bundle/platform/page/platform/release-notes/security/whats-new-security-242.html.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-11 15:25 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Pegasystems | Pega Infinity |
Affected:
7.1.0 , < Infinity 25.1.1
(custom)
|
Date Public
2025-12-10 15:00
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Mitigation MIT-46
Architecture and Design
Strategy: Separation of Privilege
- Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
- Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
Mitigation MIT-39
Implementation
- 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.
CAPEC-331: ICMP IP Total Length Field Probe
An adversary sends a UDP packet to a closed port on the target machine to solicit an IP Header's total length field value within the echoed 'Port Unreachable" error message. This type of behavior is useful for building a signature-base of operating system responses, particularly when error messages contain other types of information that is useful identifying specific operating system responses.
CAPEC-332: ICMP IP 'ID' Field Error Message Probe
An adversary sends a UDP datagram having an assigned value to its internet identification field (ID) to a closed port on a target to observe the manner in which this bit is echoed back in the ICMP error message. This allows the attacker to construct a fingerprint of specific OS behaviors.
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.