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.
References (2)
Core 2
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-hhxq-3wg7-4rj8
X_Refsource_Misc x_refsource_misc
https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7
Scores
CVSS v3
8.9
EPSS
0.0026
EPSS Percentile
16.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-79
Status
published
Products (2)
gitroom/postiz
2.21.6
gitroomhq/postiz-app
>= 2.21.6, < 2.21.7
Published
May 08, 2026
Tracked Since
May 09, 2026