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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| gitroomhq | postiz-app | < 2.21.3 | — |
Automated scanner template
A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.
- Postiz < 2.21.3 - Unauthenticated Server-Side Request Forgery http/cves/2026/CVE-2026-34577.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.