Origin Validation Error Affecting github.com/zitadel/zitadel/internal/api package, versions <3.4.12>=4.0.0 <4.15.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMZITADELZITADELINTERNALAPI-17750641
- published1 Jul 2026
- disclosed18 Jun 2026
- creditUnknown
Introduced: 18 Jun 2026
CVE-2026-55669 Â (opens in a new tab)How to fix?
Upgrade github.com/zitadel/zitadel/internal/api to version 3.4.12, 4.15.2 or higher.
Overview
Affected versions of this package are vulnerable to Origin Validation Error in the JWT validation process. An attacker can gain unauthorized access by presenting a validly signed token from a trusted issuer, originally intended for a different service, to the authentication system. This is only exploitable if the attacker possesses a valid user token from a shared, trusted issuer and the deployment uses an external Identity Provider with overlapping trust boundaries.
Workaround
This vulnerability can be mitigated by ensuring the external Identity Provider issues tokens with unique, non-overlapping audience values, or by deploying a reverse proxy, API gateway, or Web Application Firewall to inspect and drop requests where the aud field does not match the intended deployment target.