CVE-2026-42556

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.

PUBLISHED Reserved 2026-04-28 | Published 2026-05-08 | Updated 2026-05-08 | Assigner GitHub_M

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

References

github.com/...iz-app/security/advisories/GHSA-hhxq-3wg7-4rj8

github.com/gitroomhq/postiz-app/releases/tag/v2.21.7

cve.org (CVE-2026-42556)

nvd.nist.gov (CVE-2026-42556)

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