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Vulnerability record · CVE-2026-55672 · published 10 July 2026

CVE-2026-55672: Improper authentication vulnerability

ZITADEL is an open source identity management platform. Prior to 3.4.12 and 4.15.2, ZITADEL's OAuth2 and OIDC CodeExchange, RefreshToken, and device token flows fail to verify that the requesting client matches the client that initiated the authorization flow, allowing intercepted grants or refresh tokens to be exchanged under a different client. This issue is fixed in versions 3.4.12 and 4.15.2.

7.4 CVSS 3.1 High EPSS 0.43% · top 64.9% CWE-287 · Improper authenticationCWE-863 · Incorrect authorization Deferred
7.4CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
10 Jul 2026Last modified by NVD

Description

ZITADEL is an open source identity management platform. Prior to 3.4.12 and 4.15.2, ZITADEL's OAuth2 and OIDC CodeExchange, RefreshToken, and device token flows fail to verify that the requesting client matches the client that initiated the authorization flow, allowing intercepted grants or refresh tokens to be exchanged under a different client. This issue is fixed in versions 3.4.12 and 4.15.2.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

LinkTags
https://github.com/zitadel/zitadel/commit/562403079a98cf2059cdac11865a45e2f285be71
https://github.com/zitadel/zitadel/commit/5b1708e0e650398f0ebc3341714f0798b0118917
https://github.com/zitadel/zitadel/releases/tag/v3.4.12
https://github.com/zitadel/zitadel/releases/tag/v4.15.2
https://github.com/zitadel/zitadel/security/advisories/GHSA-xqxv-4jc2-x56x

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Source: NIST National Vulnerability Database (record CVE-2026-55672), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.