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.
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
History
07 Apr 2026, 21:21
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:gitroom:postiz:*:*:*:*:*:*:*:* | |
| References | () https://github.com/gitroomhq/postiz-app/commit/5ae4c950db6aa516a31454b7a45b9480bca40a11 - Patch | |
| References | () https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.4 - Product, Release Notes | |
| References | () https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-wc9c-7cv8-m225 - Exploit, Mitigation, Vendor Advisory | |
| First Time |
Gitroom
Gitroom postiz |
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-2026-34590
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)