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CVE-2026-37979— Keycloak: keycloak: information disclosure via oidc token introspection endpoint audience bypass

CVSS 6.5 · Medium EPSS 0.03% · P8

Possible ATT&CK Techniques 1AI

T1556 · Modify Authentication Process

Affected Version Matrix 4

VendorProductVersion RangeStatus
Red HatRed Hat build of Keycloak 26.426.4.12-1< *unaffected
26.4-17< *unaffected
26.4-17< *unaffected
Red HatRed Hat build of Keycloak 26.4.12anyunaffected
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I. Basic Information for CVE-2026-37979

Vulnerability Information
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Vulnerability Title
Keycloak: keycloak: information disclosure via oidc token introspection endpoint audience bypass
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in Keycloak. This access control vulnerability in Keycloak's OpenID Connect (OIDC) token introspection endpoint allows a confidential client to bypass audience restrictions. An attacker-controlled client with valid credentials can retrieve sensitive token claims intended for other resource servers, compromising the confidentiality of lightweight access tokens. This issue can be exploited remotely by any confidential client in the realm with valid credentials.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Keycloak 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在访问控制错误漏洞，该漏洞源于OpenID Connect令牌内省端点中的访问控制漏洞，允许机密客户端绕过受众限制，可能导致机密客户端检索本应属于其他资源服务器的敏感令牌声明。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Red HatRed Hat build of Keycloak 26.4 26.4.12-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red HatRed Hat build of Keycloak 26.4 26.4-17 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red HatRed Hat build of Keycloak 26.4 26.4-17 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red HatRed Hat build of Keycloak 26.4.12-cpe:/a:redhat:build_keycloak:26.4::el9

II. Public POCs for CVE-2026-37979

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III. Intelligence Information for CVE-2026-37979

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Advisory · 3

Same Patch Batch · Red Hat · 2026-05-19 · 11 CVEs total

CVE-2026-75048.1 HIGHOrg.keycloak/keycloak-services: open redirect when using wildcard valid redirect uris in k
CVE-2026-75077.5 HIGHOrg.keycloak/keycloak-services: session fixation in oidc login flow that can lead to accou
CVE-2026-73077.5 HIGHKeycloak: keycloak: denial of service via specially crafted saml input
CVE-2026-75717.1 HIGHKeycloak: keycloak: access token disclosure and implicit flow bypass via forged client dat
CVE-2026-379826.8 MEDIUMKeycloak: org.keycloak.authentication: keycloak: unauthorized account takeover via webauth
CVE-2026-46306.8 MEDIUMKeycloak: keycloak: unauthorized resource access and data modification via insecure direct
CVE-2026-89225.4 MEDIUMOrg.keycloak/keycloak-services: keycloak: org.keycloak.protocol.oidc: security flaw in org
CVE-2026-379784.9 MEDIUMKeycloak: org.keycloak.services: keycloak: information disclosure via evaluate-scopes admi
CVE-2026-379814.3 MEDIUMKeycloak: org.keycloak.authorization: keycloak: information disclosure via broken access c
CVE-2026-88304.3 MEDIUMKeycloak: org.keycloak/keycloak-services: keycloak: policy bypass during webauthn credenti

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.4
Same vendor: Red Hat

V. Comments for CVE-2026-37979

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