CVE-2026-40487 | BDVDB-2026-327643 Detail

Description#

Postiz is an AI social media scheduling tool. Prior to version 2.21.6, a file upload validation bypass allows any authenticated user to upload arbitrary HTML, SVG, or other executable file types to the server by spoofing the `Content-Type` header. The uploaded files are then served by nginx with a Content-Type derived from their original extension (`text/html`, `image/svg+xml`), enabling Stored Cross-Site Scripting (XSS) in the context of the application's origin. This can lead to session riding, account takeover, and full compromise of other users' accounts. Version 2.21.6 contains a fix.

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Exploit#

History#

1. Version 12026-04-18Record published in the CVE List.
2. Version 22026-04-20Most recent update recorded in the CVE List.