CVE-2026-56668: ZITADEL: Unauthorized Token Privilege Escalation in OAuth2 Token Exchange

September 14, 2026

A vulnerability in ZITADEL’s OAuth2 Token Exchange endpoint allows an authenticated user or client to exchange a low-privilege access token for a token with elevated permissions at a completely different application. This bypasses the intended authorization and separation policies configured within ZITADEL.

References

github.com/advisories/GHSA-vrh8-c9cm-wh8v
github.com/zitadel/zitadel/commit/e2886a61670ca8fd41c9434f87036546e5620bcc
github.com/zitadel/zitadel/releases/tag/v4.15.3
github.com/zitadel/zitadel/security/advisories/GHSA-vrh8-c9cm-wh8v
nvd.nist.gov/vuln/detail/CVE-2026-56668

Code Behaviors & Features

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