HIGH SeverityCVSS 3.18.9CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L

CVE-2026-42556

Last updated May 08, 2026 · Published May 08, 2026

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

1 listed

gitroomhq:postiz-app

Mappings

CWE

CWE-79

CAPEC

None listed.

Research

Cross-Site Scripting (XSS)Covers reflected, stored, and DOM based XSS risks and why they remain high impact. Provides prevention…

Training

XSS in React, Vue and Server ComponentsCross-site scripting in modern component frameworks and how to prevent it.

CVE-2026-42556

Description

Affected products

Mappings

Related