CVE-2026-42556
Postiz stored XSS in public preview page
CVSS Score
8.9
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | gitroomhq |
| Product | postiz-app |
| Published | May 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low
Affected Versions
gitroomhq / postiz-app
>= 2.21.6, < 2.21.7