Postiz is an AI social media scheduling tool. Prior to 2.21.5, the /api/public/stream endpoint is vulnerable to SSRF. Although the application validates the initially supplied URL and blocks direct private/internal hosts, it does not re-validate the final destination after HTTP redirects. As a result, an attacker can supply a public HTTPS URL that passes validation and then redirects the server-side request to an internal resource.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/gitroomhq/postiz-app/commit/30e8b777098157362769226d1b46d83ad616cb06 Patch
- https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-34w8-5j2v-h6ww Exploit, Mitigation, Vendor Advisory
- https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-34w8-5j2v-h6ww Exploit, Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.2 · gitroomNVD modified 2026-10-26 21:10
Affected (CPE criteria) 1
cpe:2.3:a:gitroom:postiz:*:*:*:*:*:*:*:*
References 4
- https://github.com/gitroomhq/postiz-app/commit/30e8b777098157362769226d1b46d83ad616cb06 Patch
- https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.5 Product, Release Notes
- https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-34w8-5j2v-h6ww Exploit, Mitigation, Vendor Advisory
- https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-34w8-5j2v-h6ww Exploit, Mitigation, Vendor Advisory