CVE-2026-34577 Details
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.
A server-side request forgery (SSRF) vulnerability has been identified in Postiz, an AI social media scheduling tool, prior to version 2.21.3. The issue resides in the GET /public/stream endpoint of the PublicController, which accepts a user-supplied URL query parameter and proxies the full HTTP response back to the caller. The endpoint's only validation checks if the URL ends with 'mp4', a check that can be easily bypassed. This vulnerability allows an unauthenticated attacker to access internal services, cloud metadata endpoints, and other network-internal resources, as the endpoint requires no authentication and lacks proper SSRF protections.
Users are advised to upgrade to Postiz version 2.21.3 or later, and to apply the existing 'IsSafeWebhookUrl' validation logic to the stream endpoint to prevent SSRF exploitation.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 3, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.3 | [email protected] | ProductRelease Notes |
| https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-mv6h-v3jg-g539 | [email protected] | ExploitMitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| gitroom postiz | < 2.21.3 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 7, 2026 | Initial Analysis | [email protected] |
| Apr 2, 2026 | New CVE Received | [email protected] |