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CVE-2026-7571— Keycloak: keycloak: access token disclosure and implicit flow bypass via forged client data

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存在安全漏洞，该漏洞源于低权限用户可绕过安全控制禁用OIDC客户端的隐式流，可能导致访问令牌泄露。

CVSS 7.1 · High EPSS 0.42% · P34

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
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I. Basic Information for CVE-2026-7571

Vulnerability Information
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Vulnerability Title
Keycloak: keycloak: access token disclosure and implicit flow bypass via forged client data
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in Keycloak. A low-privilege user, with knowledge of user credentials and client ID, can bypass a security control intended to disable the implicit flow in OpenID Connect (OIDC) clients. By manipulating client data during a session restart, an attacker can obtain an access token that should not be available. This vulnerability can also lead to the exposure of these access tokens in server logs, proxy logs, and HTTP Referrer headers, resulting in sensitive information disclosure.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对假设不可变Web参数的外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 安全漏洞
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存在安全漏洞，该漏洞源于低权限用户可绕过安全控制禁用OIDC客户端的隐式流，可能导致访问令牌泄露。
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-2026-7571

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III. Intelligence Information for CVE-2026-7571

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Vendor Advisories for CVE-2026-7571 (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-2026-4630 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-2026-37979 6.5 MEDIUM Keycloak: keycloak: information disclosure via oidc token introspection endpoint audience
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
Same weakness: CWE-472

V. Comments for CVE-2026-7571

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