CVE-2026-42556Postiz is an AI social media scheduling tool.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 9.0 CRITICAL (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
- 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
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jul 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
gitroom postiz gitroom:postiz | 2.21.6 | NVD |
References
- https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7product, release-notes
- https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-hhxq-3wg7-4rj8vendor-advisory
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.