SSRF in Gitroom Postiz
CVE-2026-34577
Postiz is an AI social media scheduling tool. Prior to version 2.21.3, the GET /public/stream endpoint in PublicController accepts a user-supplied url query parameter and proxies the full HTTP response back to the caller. The only validation is url.endsWith('mp4'), which is trivially bypassable by appending .mp4 as a query parameter value or URL fragment. The endpoint requires no authentication and has no SSRF protections, allowing an unauthenticated attacker to read responses from internal services, cloud metadata endpoints, and other network-internal resources. This issue has been patched in version 2.21.3.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (40.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Gitroom Postiz
- Gitroomhq Postiz-App — versions < 2.21.3
Weakness classification (CWE)
References
- github.com/gitroomhq/postiz-app/security/advisories/GHSA-mv6h-v3jg-g539 (Exploit, Mitigation, Vendor Advisory)
- github.com/gitroomhq/postiz-app/releases/tag/v2.21.3 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-34577?
- CVE-2026-34577 is a high-severity vulnerability in Gitroom Postiz, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2026-04-02.
- How severe is CVE-2026-34577?
- High severity. CVSS v3 base score is 8.6 out of 10.