XSS in Gitroomhq Postiz-app
CVE-2026-40487
Postiz is an AI social media scheduling tool. Prior to version 2.21.6, a file upload validation bypass allows any authenticated user to upload arbitrary HTML, SVG, or other executable file types to the server by spoofing the `Content-Type`…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.000 (6.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.9 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L.
Affected products
- Gitroomhq Postiz-app — versions < 2.21.6
Weakness classification (CWE)
Public proof-of-concept exploits
References
- https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-44wg-r34q-hvfx (x_refsource_CONFIRM)
- https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.6 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-40487?
- CVE-2026-40487 is a high-severity vulnerability in Gitroomhq Postiz-app, classified under Cross-site Scripting. CVSS score: 8.9/10. Published 2026-04-18.
- How severe is CVE-2026-40487?
- High severity. CVSS v3 base score is 8.9 out of 10.
- Is CVE-2026-40487 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.