CVE-2024-10039: Keycloak core Authentication Bypass Vulnerability

HIGH
Advisory Identifier: GHSA-93ww-43rr-79v3
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CVSS 7.1
CWE-295
Published
Advisory Summary

CVE-2024-10039 is a HIGH (CVSS 7.1) authentication bypass vulnerability (CWE-295: Improper Certificate Validation) affecting Keycloak core libraries in the Maven ecosystem. The issue involves keycloak mtls authentication bypass via reverse proxy tls termination. Remediation is available by upgrading affected packages to version 26.0.6.

CVE-2024-10039 at a Glance

CVE Identifier CVE-2024-10039
GHSA Identifier GHSA-93ww-43rr-79v3
Severity HIGH
CVSS v3.1 Base Score 7.1
CWE Classification CWE-295: Improper Certificate Validation
Affected Product Keycloak core
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.1

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

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

How to Fix CVE-2024-10039

To remediate this vulnerability, upgrade all affected Keycloak core 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-core fixed: 26.0.6 
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-core</artifactId>
    <version>26.0.6</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-2024-10039, 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 core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 26.0.6), 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-295: Improper Certificate Validation, where the product does not validate, or incorrectly validates, a certificate. In Keycloak core, 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 vulnerability was found in Keycloak. Deployments of Keycloak with a reverse proxy not using pass-through termination of TLS, with mTLS enabled, are affected. This issue may allow an attacker on the local network to authenticate as any user or client that leverages mTLS as the authentication mechanism.

CVE-2024-10039 Affected Keycloak core Versions

1 component(s)
Fixed Versions:
26.0.6
Product / Package Ecosystem Affected Versions Fixed Version
org.keycloak:keycloak-core
maven/org.keycloak/keycloak-core
Maven
< 26.0.6
26.0.6

References

GitHub Advisory / Wiki ADVISORY
https://github.com/keycloak/keycloak/security/advisories/GHSA-93ww-43rr-79v3
Keycloak core Source Repository REPOSITORY
https://github.com/keycloak/keycloak/issues/35217
Keycloak core Source Repository REPOSITORY
https://github.com/keycloak/keycloak

Frequently Asked Questions

What is CVE-2024-10039?
CVE-2024-10039 is a security vulnerability in Keycloak core involving Keycloak mTLS Authentication Bypass via Reverse Proxy TLS Termination under CWE-295: Improper Certificate Validation.
Which Keycloak core versions are affected?
Affected versions include releases prior to 26.0.6 across affected packages: org.keycloak:keycloak-core.
What version fixes CVE-2024-10039?
Upgrading to 26.0.6 (or the latest patched release for your respective branch) resolves the vulnerability.
Is keycloak-core affected?
Yes, org.keycloak:keycloak-core is affected in releases prior to 26.0.6. Upgrade your dependency to 26.0.6 or later.
What is the CVSS score of CVE-2024-10039?
CVE-2024-10039 has a CVSS v3.1 base score of 7.1 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2024-10039?
CVE-2024-10039 is classified under CWE-295: Improper Certificate Validation (The product does not validate, or incorrectly validates, a certificate.).
How can I check Maven dependencies for CVE-2024-10039?
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-93ww-43rr-79v3",
  "modified" : "2025-01-30T17:47:40Z",
  "published" : "2024-11-25T19:40:46Z",
  "aliases" : [ "CVE-2024-10039" ],
  "summary" : "Keycloak mTLS Authentication Bypass via Reverse Proxy TLS Termination ",
  "details" : "A vulnerability was found in Keycloak. Deployments of Keycloak with a reverse proxy not using pass-through termination of TLS, with mTLS enabled, are affected. This issue may allow an attacker on the local network to authenticate as any user or client that leverages mTLS as the authentication mechanism.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.keycloak:keycloak-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "26.0.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/security/advisories/GHSA-93ww-43rr-79v3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/issues/35217"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/keycloak/keycloak"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-295" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-11-25T19:40:46Z",
    "nvd_published_at" : null
  }
}