HIGHCVE-2026-42556Published Modified CNA GitHub_M
CVE-2026-42556: Postiz stored XSS in public preview page
Postiz is an AI social media scheduling tool. From version 2.21.6 to before version 2.21.7, any authenticated user who can create a post can store arbitrary HTML in post content by tampering their own save request and send the public preview link /p/<postId>?share=true to another user. The preview page renders that stored HTML with dangerouslySetInnerHTML on the main application origin. This issue has been patched in version 2.21.7.
Metrics
- CVSS v3.1
- 8.9
- Severity
- HIGH
- Fixed in
- —
- Affected Products
- 1
Affected packages
- gitroomhq / postiz-app>= 2.21.6, < 2.21.7
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L