CVE-2026-24735
Published: 04 February 2026
Summary
CVE-2026-24735 is a high-severity Exposure of Private Personal Information to an Unauthorized Actor (CWE-359) vulnerability in Apache Answer. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 7.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AC-14 (Permitted Actions Without Identification or Authentication) and AC-3 (Access Enforcement).
Deeper analysis
CVE-2026-24735 is an Exposure of Private Personal Information to an Unauthorized Actor vulnerability (CWE-359) affecting Apache Answer versions through 1.7.1. The issue stems from an unauthenticated API endpoint that incorrectly exposes the full revision history for deleted content, enabling unauthorized access to restricted or sensitive information. It has a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N), indicating high confidentiality impact with no requirements for privileges, user interaction, or elevated scope.
Unauthenticated attackers can exploit this vulnerability remotely over the network with low complexity. By accessing the affected API endpoint, they can retrieve the complete revision history of deleted content, potentially exposing private personal information or other sensitive data that users intended to remove.
Apache advisories recommend upgrading to version 2.0.0, which resolves the issue. Further details are available in the Apache mailing list announcement at https://lists.apache.org/thread/whxloom7mpxlyt5wzdskflsg5mzdzd60 and the oss-security mailing list post at http://www.openwall.com/lists/oss-security/2026/02/04/1.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-5384
Vulnerability details
Exposure of Private Personal Information to an Unauthorized Actor vulnerability in Apache Answer. This issue affects Apache Answer: through 1.7.1. An unauthenticated API endpoint incorrectly exposes full revision history for deleted content. This allows unauthorized user to retrieve restricted or…
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sensitive information. Users are recommended to upgrade to version 2.0.0, which fixes the issue.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Unauthenticated remote API access in public-facing Apache Answer web app directly enables T1190 (Exploit Public-Facing Application) for initial data access; resulting retrieval of sensitive/deleted content history maps to T1005 (Data from Local System).
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Enforces approved authorizations on the unauthenticated API endpoint to prevent unauthorized access to full revision history of deleted content containing sensitive information.
Prohibits retrieval of restricted revision history without identification and authentication, directly addressing the exposure via the unauthenticated endpoint.
Requires timely identification, reporting, and correction of the vulnerability through upgrade to version 2.0.0, eliminating the improper exposure of private information.