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…
Published: 2026-05-08 · CVSS: 8.9 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7