Vulnerability Description
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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gitroom | Postiz | < 2.21.4 |
Related Weaknesses (CWE)
References
- https://github.com/gitroomhq/postiz-app/commit/5ae4c950db6aa516a31454b7a45b9480bPatch
- https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.4ProductRelease Notes
- https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-wc9c-7cv8-m225ExploitMitigationVendor Advisory
FAQ
What is CVE-2026-34590?
CVE-2026-34590 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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 chec...
How severe is CVE-2026-34590?
CVE-2026-34590 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34590?
Check the references section above for vendor advisories and patch information. Affected products include: Gitroom Postiz.