{"id":"CVE-2026-43877","aliases":["GHSA-jw8g-5j46-44rp"],"url":"https://o3.security/vulnerability/CVE-2026-43877","summary":"WWBN AVideo: CSRF in userSavePhoto.php Allows Cross-Origin Overwrite of Any Logged-in User's Profile Photo with Arbitrary Bytes","details":"WWBN AVideo is an open source video platform. In versions up to and including 29.0, objects/userSavePhoto.php is a legacy profile-photo endpoint that accepts a base64 POST parameter and writes the decoded bytes to videos/userPhoto/photo<users_id>.png. Its only access control is User::isLogged(). It does not end in .json.php, so it is excluded from the project's global autoCSRFGuard (which is suffix-scoped in objects/include_config.php). There is no CSRF token, no Origin/Referer check, and no MIME validation of the decoded bytes. Because AVideo's default cookie policy is SameSite=None; Secure on HTTPS (objects/functionsPHP.php:227), an attacker who lures a logged-in user to a malicious page can overwrite that user's profile photo with arbitrary bytes and also triggers a site-wide clearCache(true) on every forged request. Commit 9c38468041505e637101c5943c5370c68f48e3ac contains an updated fix.","published":"2026-05-11T20:34:43.371Z","modified":"2026-08-07T11:51:06.454152748Z","cvss":{"score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"wwbn/avideo","fixedVersion":null}],"fix":{"url":"https://github.com/WWBN/AVideo/commit/9c38468041505e637101c5943c5370c68f48e3ac","label":"WWBN/AVideo@9c38468"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43877.json"},{"type":"ADVISORY","url":"https://github.com/WWBN/AVideo/security/advisories/GHSA-jw8g-5j46-44rp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43877"},{"type":"FIX","url":"https://github.com/WWBN/AVideo/commit/9c38468041505e637101c5943c5370c68f48e3ac"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:51:06.454152748Z"}}