CVE-2026-42556CWE-79

Postiz stored XSS in public preview page

High · published May 8, 2026

CVSS v3.1
8.9
EPSS
0%
Percentile
37.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.9 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
CVSS v4.0
Not supplied
EPSS
0.00437 · 37.0th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-05-08T22:28Z
EPSS history
Timeline
  • 08 MAY 22:28Z
    Postiz stored XSS in public preview page
    cvelistv5