CVE-2025-53641: Postiz allows header mutation in middleware facilitates resulting in SSRF

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-07-11 · updated 2026-06-17
Weakness: CWE-918

Description

Postiz is an AI social media scheduling tool. From 1.45.1 to 1.62.3, the Postiz frontend application allows an attacker to inject arbitrary HTTP headers into the middleware pipeline. This flaw enables a server-side request forgery (SSRF) condition, which can be exploited to initiate unauthorized outbound requests from the server hosting the Postiz application. This vulnerability is fixed in 1.62.3.

Affected products

gitroomhq postiz-app: from 1.45.1, < 1.62.3

References

https://github.com/gitroomhq/postiz-app/commit/65eca0e2f22155b43c78724ca43617ee52e42753
https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-48c8-25jq-m55f

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