PT-2026-57256 · Zitadel · Zitadel

Published 2026-07-10 · Updated 2026-07-10 · CVE-2026-56668

NVD

CVSS v3.1

8.1

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

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.

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-56668

Affected Products

Zitadel

References · 4

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