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CVE-2026-125652— Keycloak-services: keycloak-services: client-level mandatory pkce bypass via login-actions entry point

Quick assessment

Affected
Red Hat Red Hat Build of Keycloak
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.

在 Keycloak 的 组件中发现了一个漏洞，该组件为身份提供者提供核心的身份认证与授权逻辑。当用户在访问“密码重置”页面后发起登录时，系统会跳过对“授权码交换证明密钥”（PKCE）的强制性安全检查。这可能导致攻击者通过截获登录授权码，在无需提供必要的安全验证器的情况下，未经授权访问用户的账户。

CVSS 6.8 · Medium
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I. Basic Information for CVE-2026-125652

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: client-level mandatory pkce bypass via login-actions entry point
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the keycloak-services component of Keycloak, which provides the core authentication and authorization logic for the identity provider. The issue occurs when a user initiates a login after visiting the password reset page, causing the system to skip mandatory security checks for Proof Key for Code Exchange (PKCE). This could allow an attacker who intercepts a login code to gain unauthorized access to the user's account without needing the required security verifier.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Build of Keycloak - cpe:/a:redhat:build_keycloak:
Red Hat Red Hat Build of Keycloak - cpe:/a:redhat:build_keycloak:
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-125652

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III. Intelligence Information for CVE-2026-125652

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Other References for CVE-2026-125652 (2)

Same Patch Batch · Red Hat · 2026-11-10 · 11 CVEs total

CVE-2026-120399 7.5 HIGH Flightctl-api: flightctl-remote-access: flightctl: unbounded tls handshake in conncontext
CVE-2026-124747 7.5 HIGH Busybox: heap buffer overflow in wget ftp resume when the resume offset exceeds the report
CVE-2026-125712 7.5 HIGH Gst-plugins-base: gst-plugins-base: missing bounds checks in rtcp sdes packet parsing
CVE-2026-125704 7.5 HIGH Gstreamer: gstreamer: use-after-free in gstreamer core buffer value deserialization
CVE-2026-125672 6.6 MEDIUM Cockpit: cockpit-storaged: tang keyserver address from an untrusted luks header clevis tok
CVE-2026-121885 6.5 MEDIUM Podman: untrusted image labels allow auto-update to restart arbitrary systemd units
CVE-2026-125707 6.1 MEDIUM Gst-plugins-bad: gst-plugins-bad: off-by-one write in mxf demuxer temporal offset table
CVE-2026-125706 5.5 MEDIUM Gst-plugins-bad: gst-plugins-bad: missing bounds checks in mpeg ps pes header parsing
CVE-2026-125703 5.5 MEDIUM Gst-plugins-bad: gst-plugins-bad: bounds check errors in mxf vanc packet handling
CVE-2026-125709 4.2 MEDIUM Libstdc++: overflow leaves streambuf in inconsistent state on i/o error.

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-862