Vulnerability · Published Apr 2, 2026 · Assigned by GitHub_M

CVE-2026-34576Postiz: SSRF in upload-from-url endpoint allows fetching internal resources and cloud metadata

High 8.3

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 0.3% (higher than 20% of all known vulnerabilities).

Severity (CVSS 4.0)8.3High

Exploit odds (30 days)0.3%top 80.4% 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 version 2.21.3, the POST /public/v1/upload-from-url endpoint accepts a user-supplied URL and fetches it server-side using axios.get() with no SSRF protections. The only validation is a file extension check (.png, .jpg, etc.) which is trivially bypassed by appending an image extension to any URL path. An authenticated API user can fetch internal network resources, cloud instance metadata, and other internal services, with the response data uploaded to storage and returned to the attacker. This issue has been patched in version 2.21.3.

Affected products (as reported)

Vendor	Product	Versions
gitroomhq	postiz-app	< 2.21.3

Weakness: CWE-918 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

References

https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-89vp-m2qw-7v34 x_refsource_CONFIRM
https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.3 x_refsource_MISC