Description
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.
Affected products
gitroom: postiz
References4
- github.com/gitroomhq/postiz-app/security/advisories/GHSA-34w8-5… ExploitMitigationVendor Advisory
- github.com/gitroomhq/postiz-app/security/advisories/GHSA-34w8-5… ExploitMitigationVendor Advisory
- github.com/gitroomhq/postiz-app/commit/30e8b777098157362769226d… Patch
- github.com/gitroomhq/postiz-app/releases/tag/v2.21.5 ProductRelease Notes
Metrics
- CVSS 3.1
-
8.2
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L - EPSS — exploit probability
- 0% percentile: 33 · as of 12 November 2026
- CWE
- CWE-918
Could this be exploited in your environment?
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