CVE-2026-4630: Keycloak services Remote Code Execution Vulnerability
MODERATECVE-2026-4630 is a MODERATE (CVSS 6.8) remote code execution vulnerability (CWE-639: Authorization Bypass Through User-Controlled Key) affecting Keycloak services libraries in the Maven ecosystem. The issue involves keycloak protection api allows authenticated clients to access and modify resources owned by other resource servers. Remediation is available by upgrading affected packages to version 26.6.2.
CVE-2026-4630 at a Glance
Security Impact
CVSS: 6.8
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N).
How to Fix CVE-2026-4630
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>26.6.2</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-2026-4630, 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 26.6.2), 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-639: Authorization Bypass Through User-Controlled Key, where the system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. 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-2026-4630 Affected Keycloak services Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.keycloak:keycloak-services
|
Maven |
< 26.6.2
|
26.6.2
|
References
Frequently Asked Questions
What is CVE-2026-4630?
Which Keycloak services versions are affected?
What version fixes CVE-2026-4630?
Is keycloak-services affected?
What is the CVSS score of CVE-2026-4630?
What CWE is associated with CVE-2026-4630?
How can I check Maven dependencies for CVE-2026-4630?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-c739-f6xw-6pv2",
"modified" : "2026-06-30T19:16:10Z",
"published" : "2026-05-19T12:31:41Z",
"aliases" : [ "CVE-2026-4630" ],
"summary" : "Keycloak Protection API allows authenticated clients to access and modify resources owned by other Resource Servers",
"details" : "Keycloak's Authorization Services feature exposes a User-Managed Access Protection API that include an Insecure Direct Object Reference (IDOR) vulnerability in the Authorization Services Protection API endpoint. By knowing or obtaining a resource's unique identifier (UUID) belonging to another Resource Server within the same realm, an authenticated client could bypass authorization checks. This allows the client to perform unauthorized GET, PUT, and DELETE operations on resources, leading to information disclosure and potential unauthorized modification or deletion of data.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.keycloak:keycloak-services"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "26.6.2"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-4630"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/issues/49115"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/pull/49121"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/commit/0cea089bd19f5061f5fd47099fd6fb41a17d8c55"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/commit/1192267af8f16a7b722bdc2abbd3410c477388aa"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/commit/4e9b17cbedb828b4afc6b62399eee317d4735234"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:19596"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:19597"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/security/cve/CVE-2026-4630"
}, {
"type" : "WEB",
"url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2450245"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/keycloak/keycloak"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-639" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-06-30T19:16:10Z",
"nvd_published_at" : "2026-05-19T12:16:19Z"
}
}