CVE-2026-34576

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.

CVSS v3 7.7 HIGH

7.7^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.1 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.3	Product Release Notes
https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-89vp-m2qw-7v34	Exploit Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:gitroom:postiz:*:*:*:*:*:*:*:*

History

07 Apr 2026, 21:21

Type	Values Removed	Values Added
First Time		Gitroom Gitroom postiz
CPE		cpe:2.3:a:gitroom:postiz::::::::
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.7
References	~~() https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.3 -~~	() https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.3 - Product, Release Notes
References	~~() https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-89vp-m2qw-7v34 -~~	() https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-89vp-m2qw-7v34 - Exploit, Mitigation, Vendor Advisory

02 Apr 2026, 18:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-02 18:16

Updated : 2026-04-07 21:21

NVD link : CVE-2026-34576

Mitre link : CVE-2026-34576

CVE.ORG link : CVE-2026-34576

JSON object : View

Products Affected

gitroom

postiz

CWE

CWE-918

Server-Side Request Forgery (SSRF)

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