CVE-2026-89257 WWBN CVE debrief

Who should care

Defenders responsible for AVideo installations, particularly those with the non-default usersCanCreateNewCategories setting enabled, should assess their exposure to this vulnerability and prioritize verification and remediation efforts.

Why it matters

Defenders should care about this IDOR vulnerability in AVideo because it allows authenticated non-admin users to delete arbitrary category assets, potentially disrupting video content and requiring verification and remediation efforts.

• Potential unauthorized deletion of category assets
• Possible disruption of video content
• Required verification of AVideo installations and user capabilities
• Potential impact on video content availability

Technical summary

The AVideo application contains an insecure direct object reference (IDOR) vulnerability in the objects/categoryDeleteAssets.json.php endpoint. This vulnerability allows an authenticated non-admin user with the canUpload capability to recursively delete any category's on-disk asset directory (icons/images) by sending a POST request with an arbitrary category ID. The endpoint validates only the Category::canCreateCategory() capability and a CSRF nonce before passing the attacker-supplied $_REQUEST['id'] to Category::deleteAssets(), which recursively removes {systemRootPath}videos/categories/assets/{id}/. It omits the Category::userCanEditCategory() ownership check enforced by the sibling Category::delete(). On

Defensive priority

Defenders should prioritize verifying the presence of this vulnerability in their AVideo installations and assessing the potential impact of asset deletion.

Recommended defensive actions

• Verify the presence of this vulnerability in AVideo installations
• Assess the potential impact of asset deletion
• Implement compensating controls to prevent unauthorized asset deletion
• Monitor for suspicious activity related to category asset deletion
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source advisory provide details on the IDOR vulnerability in AVideo, including the affected endpoint and the required capabilities for exploitation. The vulnerability allows an authenticated non-admin user with the canUpload capability to recursively delete any category's on-disk asset directory (icons/images) by sending a POST request with an arbitrary category ID. The source advisory notes that Category records and videos are not deleted. As of the advisory publication, no patched version was available. Defenders

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.