Review Apache Answer Roles to Prevent Unauthorized Question Hiding
A flaw in Apache Answer through version 2.0.2 allows users with unpin rights to hide or show questions, bypassing intended permission controls.
Key points
- The vulnerability affects Apache Answer versions up to and including 2.0.2.
- Incorrect permission mapping lets users with 'unpin' rights perform 'hide' actions.
- The issue was reported by Enxin Xie on October 15 with a low severity rating.
Apache Answer environments running version 2.0.2 or earlier face a permission mapping flaw that allows unauthorized question manipulation. According to the official advisory posted on the oss-security mailing list, the question operation controller incorrectly gates hide and show operations. Instead of checking for the specific hide permission, the system validates the unpin permission. This logic error enables users who possess only the question.unpin right to hide or restore questions within the platform.
The risk
The core issue stems from a misconfiguration in the permission check logic within the question operation controller. As described in the advisory, the system relies on the wrong permission check result. In standard configurations where permissions might be bundled, this error may not be immediately apparent. However, in custom role configurations that strictly separate unpin and hide permissions, the flaw becomes exploitable. A user granted only the unpin capability can effectively bypass the hide restriction, altering the visibility of content they should not be able to control.
Who is exposed
Any organization deploying Apache Answer through version 2.0.2 is potentially affected by this vulnerability. The advisory explicitly states that the issue impacts all versions up to 2.0.2. Environments that utilize custom role configurations are at higher risk because these setups often separate the unpin and hide permissions. If a team has created roles that grant unpin rights without hide rights, users in those roles can now perform actions that were intended to be restricted.
Cost and compliance
The oss-security advisory assigns a low severity rating to this vulnerability. No specific financial costs or compliance penalties are detailed in the source material. The report does not mention any confirmed exploitation in the wild or specific data breaches resulting from this flaw. The primary concern remains the integrity of content visibility controls within the Apache Answer platform rather than direct data exfiltration or system compromise.
Our take on the response
The advisory was posted by Enxin Xie on the oss-security mailing list. Teams should verify their current Apache Answer version immediately. If running 2.0.2 or earlier, review custom role configurations to identify any users with unpin permissions who might be performing hide actions. Monitor question visibility logs for unexpected changes by users who lack explicit hide rights.
What defenders should look for
Teams usually detect permission bypasses by auditing role assignments and cross-referencing them with user activity logs. Check whether users with limited permissions are performing actions outside their defined scope. Look for sudden changes in content visibility, such as questions being hidden or restored by users who should only have pinning rights. Investigate any discrepancies between the expected permission checks and the actual actions taken in the application logs.
What to do and how to stay safe: Apache Answer
- Audit all user roles in Apache Answer to identify accounts with unpin permissions but no hide permissions.
- Review application logs for question hide or show actions performed by users lacking the explicit hide permission.
- Restrict access to the question operation controller functions until a patched version is available and deployed.
- Monitor for unusual patterns in content visibility changes that do not align with standard administrative workflows.
Step-by-step guide: Unpatched Software Response: Containment, Recovery, and Prevention Steps
General security guidance from the BlueTeam Herald newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
Which versions of Apache Answer are affected by CVE-2026-64945?
The vulnerability affects Apache Answer through version 2.0.2, according to the official advisory.
What permission allows users to hide questions incorrectly?
Users with the question.unpin permission can hide or restore questions due to the incorrect permission mapping.
When was this vulnerability reported?
Enxin Xie posted the advisory on October 15, as noted in the oss-security mailing list.
