PT-2026-29853 · Postiz · Postiz

Offset · Published 2026-04-02 · Updated 2026-04-03 · CVE-2026-34577

Positive Technologies (AI Summary)

CVSS v3.1

8.6

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Postiz versions prior to 2.21.3

Description The GET /public/stream endpoint in PublicController lacks proper validation and SSRF protections. It accepts a user-supplied url query parameter and proxies the full HTTP response back to the caller. The validation url.endsWith('mp4') is easily bypassed. This allows an unauthenticated attacker to read responses from internal services and cloud metadata endpoints.

Recommendations Update to version 2.21.3 or later.

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2026-34577

Affected Products

Postiz

References · 5

• https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-mv6h-v3jg-g539 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-34577 · Security Note
• https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.3 · Note
• https://twitter.com/CveFindCom/status/2039775644402229548 · Twitter Post
• https://twitter.com/TheHackerWire/status/2039946190142497264 · Twitter Post