CVE-2023-6787: Keycloak services Keycloak Vulnerable To Session Hijacking Vulnerability

MODERATE
Advisory Identifier: GHSA-c9h6-v78w-52wj
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CVSS 6.5
CWE-613 CWE-384 CWE-287
Published
Advisory Summary

CVE-2023-6787 is a MODERATE (CVSS 6.5) keycloak vulnerable to session hijacking vulnerability (CWE-613: Insufficient Session Expiration) affecting Keycloak services libraries in the Maven ecosystem. The issue involves keycloak vulnerable to session hijacking via re-authentication. Remediation is available by upgrading affected packages to version 22.0.10, 24.0.3.

CVE-2023-6787 at a Glance

CVE Identifier CVE-2023-6787
GHSA Identifier GHSA-c9h6-v78w-52wj
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-613: Insufficient Session Expiration
Affected Product Keycloak services
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.5

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

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

How to Fix CVE-2023-6787

To remediate this vulnerability, upgrade all affected Keycloak services 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-services fixed: 22.0.10 
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-services</artifactId>
    <version>22.0.10</version>
</dependency>
org.keycloak:keycloak-services fixed: 24.0.3 
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-services</artifactId>
    <version>24.0.3</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-2023-6787, 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 services in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 22.0.10), 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-613: Insufficient Session Expiration, where according to wasc, "insufficient session expiration is when a web site permits an attacker to reuse old session credentials or session ids for authorization.". In Keycloak services, 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. An active keycloak session can be hijacked by initiating a new authentication (having the query parameter prompt=login) and forcing the user to enter his credentials once again. If the user cancels this re-authentication by clicking Restart login, the account takeover could take place as the new session, with a different SUB, will have the same SID as the previous session.

CVE-2023-6787 Affected Keycloak services Versions

2 component(s)
Fixed Versions:
22.0.1024.0.3
Product / Package Ecosystem Affected Versions Fixed Version
org.keycloak:keycloak-services
maven/org.keycloak/keycloak-services
Maven
< 22.0.10
22.0.10
org.keycloak:keycloak-services
maven/org.keycloak/keycloak-services
Maven
≥ 23.0.0
< 24.0.3
24.0.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/keycloak/keycloak/security/advisories/GHSA-c9h6-v78w-52wj
NVD — CVE-2023-6787 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-6787
access.redhat.com/errata/rhsa-2024:18... WEB
https://access.redhat.com/errata/RHSA-2024:1867
access.redhat.com/errata/rhsa-2024:18... WEB
https://access.redhat.com/errata/RHSA-2024:1868
Keycloak services Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2023-6787
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2254375
Keycloak services Source Repository REPOSITORY
https://github.com/keycloak/keycloak

Frequently Asked Questions

What is CVE-2023-6787?
CVE-2023-6787 is a security vulnerability in Keycloak services involving Keycloak vulnerable to session hijacking via re-authentication under CWE-613: Insufficient Session Expiration.
Which Keycloak services versions are affected?
Affected versions include releases prior to 22.0.10, 24.0.3 across affected packages: org.keycloak:keycloak-services.
What version fixes CVE-2023-6787?
Upgrading to 22.0.10, 24.0.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is keycloak-services affected?
Yes, org.keycloak:keycloak-services is affected in releases prior to 22.0.10, 24.0.3. Upgrade your dependency to 22.0.10, 24.0.3 or later.
What is the CVSS score of CVE-2023-6787?
CVE-2023-6787 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2023-6787?
CVE-2023-6787 is classified under CWE-613: Insufficient Session Expiration (According to WASC, "Insufficient Session Expiration is when a web site permits an attacker to reuse old session credentials or session IDs for authorization.").
How can I check Maven dependencies for CVE-2023-6787?
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-c9h6-v78w-52wj",
  "modified" : "2025-03-14T20:25:54Z",
  "published" : "2024-04-17T18:25:29Z",
  "aliases" : [ "CVE-2023-6787" ],
  "summary" : "Keycloak vulnerable to session hijacking via re-authentication",
  "details" : "A flaw was found in Keycloak. An active keycloak session can be hijacked by initiating a new authentication (having the query parameter prompt=login) and forcing the user to enter his credentials once again. If the user cancels this re-authentication by clicking Restart login, the account takeover could take place as the new session, with a different SUB, will have the same SID as the previous session.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.keycloak:keycloak-services"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "22.0.10"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.keycloak:keycloak-services"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "23.0.0"
      }, {
        "fixed" : "24.0.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/security/advisories/GHSA-c9h6-v78w-52wj"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-6787"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2024:1867"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2024:1868"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2023-6787"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2254375"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/keycloak/keycloak"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287", "CWE-384", "CWE-613" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-17T18:25:29Z",
    "nvd_published_at" : "2024-04-25T16:15:10Z"
  }
}