Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gitroom | Postiz | < 2.21.3 |
Related Weaknesses (CWE)
References
- https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.3ProductRelease Notes
- https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-89vp-m2qw-7v34ExploitMitigationVendor Advisory
FAQ
What is CVE-2026-34576?
CVE-2026-34576 is a vulnerability with a CVSS score of 7.7 (HIGH). 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 SSR...
How severe is CVE-2026-34576?
CVE-2026-34576 has been rated HIGH with a CVSS base score of 7.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34576?
Check the references section above for vendor advisories and patch information. Affected products include: Gitroom Postiz.