CVE-2026-34577
Last modified
CVE-2026-34577 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. 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. EPSS estimates a 0.47% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Gitroom | Postiz | < 2.21.3 |
References
- https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.3Product, Release Notes
- https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-mv6h-v3jg-g539Exploit, Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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