Vulnerabilities CVE-2026-42556

CVE-2026-42556

High

Open

TLP:CLEAR

Postiz stored XSS in public preview page

NVD CVE.org

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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.

Details

CVSS Score: 8.9
EPSS Score ⓘ: 0.26%

17.5th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
Confidence: 90%
Published: May 8, 2026
Last Modified: May 8, 2026

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