CVE-2026-34590

Postiz is an AI social media scheduling tool. Prior to version 2.21.4, the POST /webhooks/ endpoint for creating webhooks uses WebhooksDto which validates the url field with only @IsUrl() (format check), missing the @IsSafeWebhookUrl validator that blocks internal/private network addresses. The update (PUT /webhooks/) and test (POST /webhooks/send) endpoints correctly apply @IsSafeWebhookUrl. When a post is published, the orchestrator fetches the stored webhook URL without runtime validation, enabling blind SSRF against internal services. This issue has been patched in version 2.21.4.

CVSS v3 5.4 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/gitroomhq/postiz-app/commit/5ae4c950db6aa516a31454b7a45b9480bca40a11	Patch
https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.4	Product Release Notes
https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-wc9c-7cv8-m225	Exploit Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

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

History

No history.

Information

Published : 2026-04-02 18:16

Updated : 2026-07-24 21:10

NVD link : CVE-2026-34590

Mitre link : CVE-2026-34590

CVE.ORG link : CVE-2026-34590

JSON object : View

Products Affected

gitroom

postiz

CWE

CWE-918

Server-Side Request Forgery (SSRF)

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