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Keycloak hostname verification

High severity GitHub Reviewed Published Apr 30, 2025 in keycloak/keycloak • Updated Aug 7, 2025

Package

maven org.keycloak:keycloak-services (Maven)

Affected versions

< 26.2.2

Patched versions

26.2.2

Description

A flaw was found in Keycloak. By setting a verification policy to 'ANY', the trust store certificate verification is skipped, which is unintended.

References

@stianst stianst published to keycloak/keycloak Apr 30, 2025
Published to the GitHub Advisory Database Apr 30, 2025
Reviewed Apr 30, 2025
Last updated Aug 7, 2025

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(2nd percentile)

Weaknesses

Improper Validation of Certificate with Host Mismatch

The product communicates with a host that provides a certificate, but the product does not properly ensure that the certificate is actually associated with that host. Learn more on MITRE.

CVE ID

CVE-2025-3501

GHSA ID

GHSA-hw58-3793-42gg

Source code

Credits

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