Vulnerability Description
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.
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-mv6h-v3jg-g539ExploitMitigationVendor Advisory
FAQ
What is CVE-2026-34577?
CVE-2026-34577 is a vulnerability with a CVSS score of 8.6 (HIGH). 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 respons...
How severe is CVE-2026-34577?
CVE-2026-34577 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34577?
Check the references section above for vendor advisories and patch information. Affected products include: Gitroom Postiz.