Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
Red Hat Red Hat build of Keycloak 26.4
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 6.5 · Medium EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process

Affected Version Matrix 4

VendorProduct Version RangeStatus
Red Hat Red Hat build of Keycloak 26.4 26.4.12-1< * unaffected
26.4-17< * unaffected
26.4-17< * unaffected
Red Hat Red Hat build of Keycloak 26.4.12 any unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-37979

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Keycloak: keycloak: information disclosure via oidc token introspection endpoint audience bypass
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat build of Keycloak 26.4 26.4.12-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-17 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-17 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.12 - cpe:/a:redhat:build_keycloak:26.4::el9

II. Public POCs for CVE-2026-37979

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-37979

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-37979 (4)

Same Patch Batch · Red Hat · 2026-05-19 · 10 CVEs total

CVE-2026-7504 8.1 HIGH Org.keycloak/keycloak-services: open redirect when using wildcard valid redirect uris in k
CVE-2026-7507 7.5 HIGH Org.keycloak/keycloak-services: session fixation in oidc login flow that can lead to accou
CVE-2026-7571 7.1 HIGH Keycloak: keycloak: access token disclosure and implicit flow bypass via forged client dat
CVE-2026-4630 6.8 MEDIUM Keycloak: keycloak: unauthorized resource access and data modification via insecure direct
CVE-2026-37982 6.8 MEDIUM Keycloak: org.keycloak.authentication: keycloak: unauthorized account takeover via webauth
CVE-2026-8922 5.4 MEDIUM Org.keycloak/keycloak-services: keycloak: org.keycloak.protocol.oidc: security flaw in org
CVE-2026-37978 4.9 MEDIUM Keycloak: org.keycloak.services: keycloak: information disclosure via evaluate-scopes admi
CVE-2026-8830 4.3 MEDIUM Keycloak: org.keycloak/keycloak-services: keycloak: policy bypass during webauthn credenti
CVE-2026-37981 4.3 MEDIUM Keycloak: org.keycloak.authorization: keycloak: information disclosure via broken access c

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-37979

No comments yet

Leave a comment