EUVD-2026-17638
GHSA-c4xj-x7p8-3x7q
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Lifecycle Timeline
4Description
WWBN AVideo is an open source video platform. In versions 26.0 and prior, the AVideo endpoint objects/emailAllUsers.json.php allows administrators to send HTML emails to every registered user on the platform. While the endpoint verifies admin session status, it does not validate a CSRF token. Because AVideo sets SameSite=None on session cookies, a cross-origin POST request from an attacker-controlled page will include the admin's session cookie automatically. An attacker who lures an admin to a malicious page can send an arbitrary HTML email to every user on the platform, appearing to originate from the instance's legitimate SMTP address. At time of publication, there are no publicly available patches.
Analysis
CSRF vulnerability in WWBN AVideo 26.0 and prior allows unauthenticated attackers to send arbitrary HTML emails to all platform users by luring administrators to a malicious webpage. The vulnerability exploits absent CSRF token validation on the emailAllUsers.json.php endpoint combined with SameSite=None session cookie configuration, enabling cross-origin POST requests to execute with the admin's session credentials. …
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