PT-2026-29853 · Gitroomhq · Postiz-App

Offset · Published 2026-04-02 · Updated 2026-04-02 · CVE-2026-34577

Mitre

CVSS v3.1

8.6

High

AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

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.

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2026-34577

Affected Products

Postiz-App

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-34577 · Security Note
• https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.3 · Note
• https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-mv6h-v3jg-g539 · Note