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.
References
| Link | Resource |
|---|---|
| https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.3 | Product Release Notes |
| https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-mv6h-v3jg-g539 | Exploit Mitigation Vendor Advisory |
Configurations
History
07 Apr 2026, 21:21
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Gitroom
Gitroom postiz |
|
| References | () https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.3 - Product, Release Notes | |
| References | () https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-mv6h-v3jg-g539 - Exploit, Mitigation, Vendor Advisory | |
| CPE | cpe:2.3:a:gitroom:postiz:*:*:*:*:*:*:*:* |
02 Apr 2026, 18:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-04-02 18:16
Updated : 2026-04-07 21:21
NVD link : CVE-2026-34577
Mitre link : CVE-2026-34577
CVE.ORG link : CVE-2026-34577
JSON object : View
Products Affected
gitroom
- postiz
CWE
CWE-918
Server-Side Request Forgery (SSRF)