Postiz allows header mutation in middleware facilitates resulting in SSRF

published 2025-07-11 15 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-21168

cvss: 8.2; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 20%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 links 1

gitroom postiz 1.62.3

github.com/gitroomhq/postiz-app@65eca0e commit

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 15 mo ago (2025-07-11)

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.2	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Affected products

gitroomhq postiz-app

Classification

Weakness

CWE-918 Server-Side Request Forgery

References

Sources

CVE List CVE-2025-53641
NVD CVE-2025-53641

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary