Description

WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 fails to validate video access permissions in the commentAddNew.json.php endpoint, allowing authenticated users to post comments on password-protected and group-restricted videos. Attackers can submit POST requests with a valid session to add comments to videos they cannot watch, bypassing password and group access controls.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "4.3",
  "pubDate": "2026-09-12T13:16:52.777Z",
  "pubdate": "2026-09-12T13:16:52.777Z",
  "executiveSummary": "The WWBN AVideo platform contains a broken access control vulnerability within the commentAddNew.json.php endpoint. This flaw allows authenticated users to bypass authorization mechanisms that should restrict interaction with sensitive media content.\nSpecifically, the application fails to validate whether an authenticated user possesses the necessary permissions—such as the correct password or group membership—before allowing the submission of comments on restricted videos.\nThis vulnerability constitutes an Improper Authorization (CWE-285) issue, where the backend logic treats comment submission as an independent action from the media access control policy.\nAn authenticated attacker can leverage this flaw to interact with password-protected or group-restricted content that should otherwise be inaccessible to them. The primary risk involves the unauthorized dissemination of information or the ability to deface or spam comments on private media assets.\nExploitation requires a valid user session, meaning the attacker must be a registered member of the platform. No administrative or elevated privileges are required beyond basic authentication to trigger the failure in the access control logic.",
  "technicalDetails": "The vulnerability resides in the commentAddNew.json.php file, which serves as the server-side processor for the comment submission functionality in WWBN AVideo. Analysis of the commit history up to c3edcc274c389816d434acadac07ee78eaf330c1 reveals that the application logic fails to perform a secondary authorization check during the POST request lifecycle.\nThe root cause is the decoupling of the comment submission workflow from the video permission verification system. While the video viewing interface enforces restrictions based on video privacy settings (password protection) and group-based access control lists (ACLs), the commentAddNew.json.php endpoint treats the video identifier (video_id) as a trusted parameter without validating the user's implicit or explicit authorization to interact with the target media object.\nThe attack flow proceeds as follows: First, the attacker identifies a target video that is restricted via password or group membership. Second, the attacker initiates a standard authenticated session. Third, the attacker constructs a POST request targeting commentAddNew.json.php, including the identifier of the restricted video and the desired comment body. Because the endpoint lacks a mandatory access control check, the server-side script proceeds to insert the comment into the database associated with the target video regardless of the user's actual access status.\nThe vulnerable component is the server-side validation logic within the comment submission module. This component is exposed via HTTP POST requests and requires the attacker to be authenticated to the platform. Since the application fails to verify the relationship between the session user and the target resource (the video), the security boundary protecting sensitive media is effectively bypassed. The payload does not require advanced obfuscation; simple standard HTTP communication is sufficient to influence the state of a private or restricted video record.\nPost-exploitation impact includes the ability for an attacker to leave unsolicited content on private videos, potentially leaking information, manipulating the perception of the video owner, or using the comment section as a medium for spam or social engineering against authorized viewers who might be misled by comments appearing on restricted media."
}