CVE-2025-12390: Keycloak services Keycloak Vulnerable To Session Takeovers Vulnerability
MODERATECVE-2025-12390 is a MODERATE (CVSS 6.0) keycloak vulnerable to session takeovers vulnerability (CWE-384: Session Fixation) affecting Keycloak services libraries in the Maven ecosystem. The issue involves keycloak vulnerable to session takeovers due to reuse of session identifiers. Remediation is available by upgrading affected packages to version 26.0.0.
CVE-2025-12390 at a Glance
Security Impact
CVSS: 6.0
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N).
How to Fix CVE-2025-12390
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.
<dependency>
<groupId>org.keycloak</groupId>
<artifactId>keycloak-services</artifactId>
<version>26.0.0</version>
</dependency>Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=org.keycloakHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2025-12390, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=org.keycloakAnalyze 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 26.0.0), 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-384: Session Fixation, where authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions. 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
CVE-2025-12390 Affected Keycloak services Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.keycloak:keycloak-services
|
Maven |
< 26.0.0
|
26.0.0
|
References
Frequently Asked Questions
What is CVE-2025-12390?
Which Keycloak services versions are affected?
What version fixes CVE-2025-12390?
Is keycloak-services affected?
What is the CVSS score of CVE-2025-12390?
What CWE is associated with CVE-2025-12390?
How can I check Maven dependencies for CVE-2025-12390?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-rg35-5v25-mqvp",
"modified" : "2025-12-20T05:40:24Z",
"published" : "2025-10-28T15:30:43Z",
"aliases" : [ "CVE-2025-12390" ],
"summary" : "Keycloak vulnerable to session takeovers due to reuse of session identifiers",
"details" : "A flaw was found in Keycloak. In Keycloak where a user can accidentally get access to another user's session if both use the same device and browser. This happens because Keycloak sometimes reuses session identifiers and doesn’t clean up properly during logout when browser cookies are missing. As a result, one user may receive tokens that belong to another user.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.keycloak:keycloak-services"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "26.0.0"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-12390"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/issues/32197"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/issues/43853"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/commit/5344aada5ee06b02ec3a9e0f52fa381d085b6282"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/commit/b46fab230824a2304daafe74be019e8bd4ee590a"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/commit/d82438a611f2f869f1966c13012953fe963a493d"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/commit/ef75a4dc50aa9459777494e4b88655100bf2ac80"
}, {
"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/errata/RHSA-2025:22088"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2025:22089"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/security/cve/CVE-2025-12390"
}, {
"type" : "WEB",
"url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2406793"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/keycloak/keycloak"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/discussions/31265"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-384" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2025-10-29T15:35:45Z",
"nvd_published_at" : "2025-10-28T14:15:57Z"
}
}