CWE-204

Observable Response Discrepancy

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.

CVE-2024-56476 (GCVE-0-2024-56476)
Vulnerability from cvelistv5
Published
2025-04-02 15:33
Modified
2025-09-01 00:57
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Response Discrepancy Information Exposure
Summary
IBM TXSeries for Multiplatforms 9.1 and 11.1 could allow an attacker to enumerate usernames due to an observable login attempt response discrepancy.
References
https://www.ibm.com/support/pages/node/7229880vendor-advisory, patch
Impacted products
Vendor Product Version
IBM TXSeries for Multiplatforms Version: 9.1
Version: 11.1
    cpe:2.3:a:ibm:txseries_for_multiplatforms:9.1:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:txseries_for_multiplatforms:11.1:*:*:*:*:*:*:*
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CVE-2025-0163 (GCVE-0-2025-0163)
Vulnerability from cvelistv5
Published
2025-06-11 14:20
Modified
2025-08-24 11:55
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Response Discrepancy Information Exposure
Summary
IBM Security Verify Access Appliance and Docker 10.0 through 10.0.8 could allow a remote attacker to enumerate usernames due to an observable response discrepancy of disabled accounts.
References
https://www.ibm.com/support/pages/node/7236314vendor-advisory, patch
Impacted products
Vendor Product Version
IBM Security Verify Access Version: 10.0   ≤ 10.0.8
    cpe:2.3:a:ibm:security_verify_access:10.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:security_verify_access:10.0.8:*:*:*:*:*:*:*
 Create a notification for this product.
   IBM Security Verify Access Docker Version: 10.0   ≤ 10.0.8
    cpe:2.3:a:ibm:security_verify_access_docker:10.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:security_verify_access_docker:10.0.8:*:*:*:*:*:*:*
 Create a notification for this product.
Show details on NVD website

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CVE-2025-27451 (GCVE-0-2025-27451)
Vulnerability from cvelistv5
Published
2025-07-03 11:27
Modified
2025-07-03 13:16
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
For failed login attempts, the application returns different error messages depending on whether the login failed due to an incorrect password or a non-existing username. This allows an attacker to guess usernames until they find an existing one.
References
https://www.endress.comx_Endress+Hauser
https://sick.com/psirtx_SICK PSIRT Security Advisories
https://www.cisa.gov/resources-tools/resources/ics-recommended-practicesx_ICS-CERT recommended practices on Industrial Security
https://www.first.org/cvss/calculator/3.1x_CVSS v3.1 Calculator
https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0008.jsonx_The canonical URL.
https://sick.com/psirtvendor-advisory
https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0008.pdfvendor-advisory
Impacted products
Vendor Product Version
Endress+Hauser Endress+Hauser MEAC300-FNADE4 Version: 0   <
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   Endress+Hauser Endress+Hauser MEAC300-FNADE4 Patch: >=0.17.0
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CVE-2025-46390 (GCVE-0-2025-46390)
Vulnerability from cvelistv5
Published
2025-08-06 10:55
Modified
2025-08-06 13:12
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
CWE-204: Observable Response Discrepancy
References
https://www.gov.il/en/departments/dynamiccollectors/cve_advisories_listing?skip=0
Impacted products
Vendor Product Version
Emby MediaBrowser Version: 4.9.0.35
 Create a notification for this product.
Show details on NVD website

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CVE-2025-52899 (GCVE-0-2025-52899)
Vulnerability from cvelistv5
Published
2025-07-29 19:16
Modified
2025-07-29 19:34
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
Tuleap is an Open Source Suite created to facilitate management of software development and collaboration. In Tuleap Community Edition prior to version 16.9.99.1750843170 and Tuleap Enterprise Edition prior to 16.8-4 and 16.9-2, the forgot password form allows for user enumeration. This is fixed in Tuleap Community Edition version 16.9.99.1750843170 and Tuleap Enterprise Edition 16.8-4 and 16.9-2.
References
https://github.com/Enalean/tuleap/security/advisories/GHSA-xqf3-xxxf-x3c2x_refsource_CONFIRM
https://github.com/Enalean/tuleap/commit/5c72d6d253016d38ed472eb7918f772d074ddb07x_refsource_MISC
https://tuleap.net/plugins/git/tuleap/tuleap/stable?a=commit&h=5c72d6d253016d38ed472eb7918f772d074ddb07x_refsource_MISC
https://tuleap.net/plugins/tracker/?aid=43674x_refsource_MISC
Impacted products
Vendor Product Version
Enalean tuleap Version: Tuleap Community Edition < 16.9.99.1750843170
Version: Tuleap Enterprise Edition >= 16.9, < 16.9-2
Version: Tuleap Enterprise Edition < 16.8-4
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CVE-2025-54129 (GCVE-0-2025-54129)
Vulnerability from cvelistv5
Published
2025-07-21 20:53
Modified
2025-07-22 20:44
Severity ?
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
HAXiam is a packaging wrapper for HAXcms which allows anyone to spawn their own microsite management platform. In versions 11.0.4 and below, the application returns a 200 response when requesting the data of a valid user and a 404 response when requesting the data of an invalid user. This can be used to infer the existence of valid user accounts. An authenticated attacker can use automated tooling to brute force potential usernames and use the application's response to identify valid accounts. This can be used in conjunction with other vulnerabilities, such as the lack of authorization checks, to enumerate and deface another user's sites. This is fixed in version 11.0.5.
References
https://github.com/haxtheweb/issues/security/advisories/GHSA-wh3h-vfcv-m5g5x_refsource_CONFIRM
Impacted products
Vendor Product Version
haxtheweb issues Version: < 11.0.5
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CVE-2025-54834 (GCVE-0-2025-54834)
Vulnerability from cvelistv5
Published
2025-07-31 17:26
Modified
2025-07-31 18:16
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6.9 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
OPEXUS FOIAXpress Public Access Link (PAL) version v11.1.0 allows an unauthenticated, remote attacker to query the /App/CreateRequest.aspx endpoint to check for the existence of valid usernames. There are no rate-limiting mechanisms in place.
References
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-25-174-01.json
https://www.cve.org/CVERecord?id=CVE-2025-54834
https://docs.opexustech.com/docs/foiaxpress/11.12.0/FOIAXpress_Release_notes_11.12.3.0.pdf
Impacted products
Vendor Product Version
OPEXUS FOIAXpress Public Access Link (PAL) Version: 11.1.0   < 11.12.3.0
 Create a notification for this product.
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CVE-2025-58442 (GCVE-0-2025-58442)
Vulnerability from cvelistv5
Published
2025-09-09 19:46
Modified
2025-09-10 13:50
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
Saleor is an e-commerce platform. Starting in version 3.21.0 and prior to version 3.21.16, requesting certain fields in the response of `accountRegister` may result in errors that could unintentionally reveal whether a user with the provided email already exists in Saleor. Version 3.21.16 fixes the issue. As a workaround, rate-limit the mutation to reduce the impact.
References
https://github.com/saleor/saleor/security/advisories/GHSA-8w67-mfm5-fwx5x_refsource_CONFIRM
https://github.com/saleor/saleor/commit/09d671e91ea53a44352d5f685083dc05a2f55e95x_refsource_MISC
https://github.com/saleor/saleor/commit/b35783838e51cfc118e07d632f64b01bc3a2c4bbx_refsource_MISC
https://github.com/saleor/saleor/releases/tag/3.21.16x_refsource_MISC
Impacted products
Vendor Product Version
saleor saleor Version: >= 3.21.0, < 3.21.16
 Create a notification for this product.
Show details on NVD website

To clipboard 

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          ],
          "url": "https://github.com/saleor/saleor/security/advisories/GHSA-8w67-mfm5-fwx5"
        },
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          "name": "https://github.com/saleor/saleor/commit/09d671e91ea53a44352d5f685083dc05a2f55e95",
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      "title": "Saleor has user enumeration vulnerability due to different error messages"
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CVE-2025-9109 (GCVE-0-2025-9109)
Vulnerability from cvelistv5
Published
2025-08-18 06:02
Modified
2025-08-18 15:34
Severity ?
2.9 (Low) - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
3.7 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RC:R
3.7 (Low) - CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RC:R
CWE
  • CWE-204 - Observable Response Discrepancy
  • CWE-203 - Information Exposure Through Discrepancy
Summary
A security flaw has been discovered in Portabilis i-Diario up to 1.5.0. Affected by this vulnerability is an unknown functionality of the file /password/email of the component Password Recovery Endpoint. The manipulation results in observable response discrepancy. It is possible to launch the attack remotely. This attack is characterized by high complexity. The exploitation appears to be difficult. The exploit has been released to the public and may be exploited.
References
https://vuldb.com/?id.320431vdb-entry
https://vuldb.com/?ctiid.320431signature, permissions-required
https://vuldb.com/?submit.627926third-party-advisory
Impacted products
Vendor Product Version
Portabilis i-Diario Version: 1.0
Version: 1.1
Version: 1.2
Version: 1.3
Version: 1.4
Version: 1.5.0
 Create a notification for this product.
Show details on NVD website

To clipboard 

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CVE-2025-9824 (GCVE-0-2025-9824)
Vulnerability from cvelistv5
Published
2025-09-03 14:25
Modified
2025-09-03 14:46
Severity ?
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Summary
ImpactThe attacker can validate if a user exists by checking the time login returns. This timing difference can be used to enumerate valid usernames, after which an attacker could attempt brute force attacks. PatchesThis vulnerability has been patched, implementing a timing-safe form login authenticator that ensures consistent response times regardless of whether a user exists or not. Technical DetailsThe vulnerability was caused by different response times when: * A valid username was provided (password hashing occurred) * An invalid username was provided (no password hashing occurred) The fix introduces a TimingSafeFormLoginAuthenticator that performs a dummy password hash verification even for non-existent users, ensuring consistent timing. WorkaroundsNo workarounds are available. Users should upgrade to the patched version. References * https://owasp.org/www-project-web-security-testing-guide/latest/4-Web_Application_Security_Testing/03-Identity_Management_Testing/04-Testing_for_Account_Enumeration_and_Guessable_User_Account
References
https://github.com/mautic/mautic/security/advisories/GHSA-3ggv-qwcp-j6xg
Impacted products
Vendor Product Version
Mautic Mautic Version: >= 4.4.0   ≤
Version: >= 5.0.0-alpha   ≤
Version: >= 6.0.0-alpha   ≤
Create a notification for this product.
Show details on NVD website

To clipboard 

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Mitigation ID: MIT-46

Phase: Architecture and Design

Strategy: Separation of Privilege

Description:

  • 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 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.
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.

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