CVE-2026-125652
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Keycloak PKCE Security Bypass in Login Flow

Publication date: 2026-11-10

Last updated on: 2026-11-10

Assigner: redhat-SADP

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.

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Meta Information

Published
2026-11-10
Last Modified
2026-11-10
Generated
2026-11-10
AI Q&A
2026-11-10
EPSS Evaluated
N/A
NVD
CVE-2026-125652
EUVD
EUVD-2026-120850

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
Red Hat Red Hat Build of Keycloak *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

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Executive Summary

This vulnerability in Keycloak occurs when a user logs in after visiting the password reset page. The system skips mandatory Proof Key for Code Exchange (PKCE) security checks, allowing an attacker who intercepts a login code to gain unauthorized access to the user's account without the required security verifier.

Impact Analysis

An attacker could intercept a login code and use it to impersonate you, gaining access to your account and potentially protected data. This requires the attacker to intercept the authorization code during the login process.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, potentially violating compliance requirements such as GDPR or HIPAA, which mandate strict access controls and data protection measures.

Mitigation Strategies

No immediate mitigation steps are currently available from Red Hat. The vulnerability is tracked under CWE-862 and requires a fix from the Keycloak development team. Monitor official Keycloak and Red Hat advisories for updates.

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