🛡️ CVE-2026-34577
🟠 CVSS 8.6 — High ⚠️ Exploit Public CWE-918 NVD
8.6
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 8.6
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
CWE CWE-918
Public Exploit ⚠️ Yes
Source NVD
Published 2026-04-02
Updated 2026-06-02
Modified 2026-04-07
Fix URL N/A

Affected Packages

Software From version Fixed in
postiz — 2.21.3

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