CVE-2026-56668: Zitadel

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's OAuth2 Token Exchange endpoint for urn:ietf:params:oauth:grant-type:token-exchange does not verify that the subject token belongs to the requesting client or that requested scopes remain within the original token's scopes, allowing a low-privilege token to be exchanged for elevated permissions at another application. This issue is fixed in version 4.15.3.

Affected products

• Zitadel Zitadel: before 4.15.3 (fixed in 4.15.3)

Published 2026-07-10. Last modified 2026-07-14.