CVE-2026-42556CRITICAL 9.0EPSS p16.9%

CVE-2026-42556CVE-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.

Scoring

CVSS 3.19.0 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
EPSS0.26% probability of exploitation · percentile 16.9% · 2026-06-18T12:00:27Z
Published2026-05-08
Last modified2026-05-18

Underlying weaknesses· 1

CWE-79

References

  1. https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7
  2. https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-hhxq-3wg7-4rj8

1

TypeTargetConfidenceTier
WeaknessImproper Neutralization of Input During Web Page Generation ('Cross-site Scripting')cwe-790%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.