SSRF in Gitroom Postiz
CVE-2026-34576
Postiz is an AI social media scheduling tool. Prior to version 2.21.3, the POST /public/v1/upload-from-url endpoint accepts a user-supplied URL and fetches it server-side using axios.get() with no SSRF protections. The only validation is a file extension check (.png, .jpg, etc.) which is trivially bypassed by appending an image extension to any URL path. An authenticated API user can fetch internal network resources, cloud instance metadata, and other internal services, with the response data uploaded to storage and returned to the attacker. 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 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · 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-89vp-m2qw-7v34 (Exploit, Mitigation, Vendor Advisory)
- github.com/gitroomhq/postiz-app/releases/tag/v2.21.3 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-34576?
- CVE-2026-34576 is a high-severity vulnerability in Gitroom Postiz, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-04-02.
- How severe is CVE-2026-34576?
- High severity. CVSS v3 base score is 7.7 out of 10.