SSRF in Gitroom Postiz
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (13.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 13.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Gitroom Postiz
- Gitroomhq Postiz-App — versions < 2.21.4
Weakness classification (CWE)
References
- github.com/gitroomhq/postiz-app/security/advisories/GHSA-wc9c-7cv8-m225 (Exploit, Mitigation, Vendor Advisory)
- github.com/gitroomhq/postiz-app/commit/5ae4c950db6aa516a31454b7a45b9480bca40a11 (Patch)
- github.com/gitroomhq/postiz-app/releases/tag/v2.21.4 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-34590?
- CVE-2026-34590 is a medium-severity vulnerability in Gitroom Postiz, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.4/10. Published 2026-04-02.
- How severe is CVE-2026-34590?
- Medium severity. CVSS v3 base score is 5.4 out of 10.