CVE-2026-40487
CVE-2026-40487
8.9
HighPublished:
Last updated:
Source:security-advisories@github.com
Analyzed
CVSS Vector
v3.1- Attack Vector
- Network
- Attack Complexity
- Low
- Privileges Required
- Low
- User Interaction
- Required
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- Low
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.
References
security-advisories@github.com
https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.6security-advisories@github.com
https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-44wg-r34q-hvfx134c704f-9b21-4f2e-91b3-4a467353bcc0
https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-44wg-r34q-hvfx