CVE-2026-56668 — ZITADEL: Unauthorized Token Privilege Escalation in OAuth2 Token Exchange
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 ve…
Published: 2026-07-10 · CVSS: 8.1 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7