What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.7 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: yes
• Published: 2026-04-02 · updated 2026-07-24
• Weakness: CWE-918

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

• gitroomhq postiz-app: before 2.21.3 — fixed in 2.21.3

How to fix

Upgrade to a fixed version: gitroomhq postiz-app 2.21.3. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2026-34576 or the next vulnerability affects your stack