Skip to content
OpenAdvisories
High · 8.9 CVE-2026-42556 EUVD-2026-28866

Postiz stored XSS in public preview page

Published May 8, 2026 · Updated May 13, 2026 · Assigned by GitHub_M

Description

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.

Affected products

VendorProductAffectedFixed
gitroomhq postiz-app >= 2.21.6, < 2.21.7 —

References