High 8.9Published May 8, 2026

CVE-2026-42556Postiz stored XSS in public preview page

Updated under an hour ago (Oct 27, 2026, 8:10 AM ET)

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It affects gitroomhq postiz-app and 1 other product. Add what you run to find out whether that includes you.

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Every CVE for gitroomhq postiz-app

Exploited in the last 30 days

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.

CVSS: 8.9 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: May 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

gitroomhq postiz-app gitroomhq:postiz_app (from the name)	from 2.21.6, < 2.21.7	CNA record
gitroom postiz gitroom:postiz	2.21.6	NVD

References

References

https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-hhxq-3wg7-4rj8	x-refsource-confirm, vendor-advisory
https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.