Vulnerability · Published Apr 10, 2026 · Assigned by GitHub_M

CVE-2026-40168Postiz has Server-Side Request Forgery via Redirect Bypass in /api/public/stream

High 8.2

In plain English

A high-severity server-side request forgery in postiz-app from gitroomhq. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities).

Severity (CVSS 3.1)8.2High

Exploit odds (30 days)0.4%top 68.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
gitroomhq	postiz-app	< 2.21.5

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L

References

https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-34w8-5j2v-h6ww x_refsource_CONFIRM
https://github.com/gitroomhq/postiz-app/commit/30e8b777098157362769226d1b46d83ad616cb06 x_refsource_MISC
https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.5 x_refsource_MISC