CVE-2025-10939: Keycloak quarkus server Keycloak Unable To Restrict Access Vulnerability

LOW
Advisory Identifier: GHSA-vjr8-56p3-fmqq
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CVSS 3.7
CWE-427
Published
Advisory Summary

CVE-2025-10939 is a LOW (CVSS 3.7) keycloak unable to restrict access vulnerability (CWE-427: Uncontrolled Search Path Element) affecting Keycloak quarkus server libraries in the Maven ecosystem. The issue involves keycloak unable to restrict access to the admin console. Remediation is available by upgrading affected packages to version 26.4.4.

CVE-2025-10939 at a Glance

CVE Identifier CVE-2025-10939
GHSA Identifier GHSA-vjr8-56p3-fmqq
Severity LOW
CVSS v3.1 Base Score 3.7
CWE Classification CWE-427: Uncontrolled Search Path Element
Affected Product Keycloak quarkus server
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 3.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2025-10939

To remediate this vulnerability, upgrade all affected Keycloak quarkus server dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.keycloak:keycloak-quarkus-server fixed: 26.4.4 
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-quarkus-server</artifactId>
    <version>26.4.4</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.keycloak

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2025-10939, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.keycloak

Analyze the terminal output to locate any version of Keycloak quarkus server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 26.4.4), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.keycloak command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-427: Uncontrolled Search Path Element, where the product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors. In Keycloak quarkus server, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A flaw was found in Keycloak. The Keycloak guides recommend to not expose /admin path to the outside in case the installation is using a proxy. The issue occurs at least via ha-proxy, as it can be tricked to using relative/non-normalized paths to access the /admin application path relative to /realms which is expected to be exposed.

CVE-2025-10939 Affected Keycloak quarkus server Versions

1 component(s)
Fixed Versions:
26.4.4
Product / Package Ecosystem Affected Versions Fixed Version
org.keycloak:keycloak-quarkus-server
maven/org.keycloak/keycloak-quarkus-server
Maven
< 26.4.4
26.4.4

References

GitHub Advisory / Wiki ADVISORY
https://github.com/keycloak/keycloak/security/advisories/GHSA-vjr8-56p3-fmqq
NVD — CVE-2025-10939 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-10939
access.redhat.com/errata/rhsa-2025:21... WEB
https://access.redhat.com/errata/RHSA-2025:21370
access.redhat.com/errata/rhsa-2025:21... WEB
https://access.redhat.com/errata/RHSA-2025:21371
Keycloak quarkus server Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2025-10939
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2398025
Keycloak quarkus server Source Repository REPOSITORY
https://github.com/keycloak/keycloak

Frequently Asked Questions

What is CVE-2025-10939?
CVE-2025-10939 is a security vulnerability in Keycloak quarkus server involving Keycloak unable to restrict access to the admin console under CWE-427: Uncontrolled Search Path Element.
Which Keycloak quarkus server versions are affected?
Affected versions include releases prior to 26.4.4 across affected packages: org.keycloak:keycloak-quarkus-server.
What version fixes CVE-2025-10939?
Upgrading to 26.4.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is keycloak-quarkus-server affected?
Yes, org.keycloak:keycloak-quarkus-server is affected in releases prior to 26.4.4. Upgrade your dependency to 26.4.4 or later.
What is the CVSS score of CVE-2025-10939?
CVE-2025-10939 has a CVSS v3.1 base score of 3.7 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2025-10939?
CVE-2025-10939 is classified under CWE-427: Uncontrolled Search Path Element (The product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors.).
How can I check Maven dependencies for CVE-2025-10939?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.keycloak'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-vjr8-56p3-fmqq",
  "modified" : "2025-12-02T01:21:33Z",
  "published" : "2025-12-02T01:21:33Z",
  "aliases" : [ "CVE-2025-10939" ],
  "summary" : "Keycloak unable to restrict access to the admin console",
  "details" : "A flaw was found in Keycloak. The Keycloak guides recommend to not expose /admin path to the outside in case the installation is using a proxy. The issue occurs at least via ha-proxy, as it can be tricked to using relative/non-normalized paths to access the /admin application path relative to /realms which is expected to be exposed.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.keycloak:keycloak-quarkus-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "26.4.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/security/advisories/GHSA-vjr8-56p3-fmqq"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-10939"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2025:21370"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2025:21371"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2025-10939"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2398025"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/keycloak/keycloak"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-427" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-12-02T01:21:33Z",
    "nvd_published_at" : null
  }
}