low2.3
CVE-2026-55671
ZITADEL: Server-Side Request Forgery (SSRF) and Denylist Bypass in Outgoing HTTP Components
Impact
ZITADEL is an open source identity management platform. From 4.0.0-rc.1 through 4.15.1, ZITADEL's HTTP notification channels, OIDC BackChannel Logout, and SAML metadata URL fetches do not consistently validate user-defined URLs against protected denylist handling, allowing server-side requests to loopback, internal IP, link-local, or redirected endpoints through DNS rebinding, redirects, or protocol downgrades. This issue is fixed in version 4.15.2.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/zitadel/zitadel | < 1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2 | 1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-29jh-8cfq-rr8x
- https://github.com/zitadel/zitadel/security/advisories/GHSA-29jh-8cfq-rr8x
- https://github.com/zitadel/zitadel/commit/8e82ec1cb9a2b154ff48d3a0fa96b43d1428061f
- https://github.com/zitadel/zitadel/releases/tag/v4.15.2
- https://github.com/zitadel/zitadel/commit/b6f78086913b8d916bce9ab2e049ab0d84f947fd