CVE-2026-37981: Keycloak services Remote Code Execution Vulnerability
MODERATECVE-2026-37981 is a MODERATE (CVSS 4.3) remote code execution vulnerability (CWE-1220: Insufficient Granularity of Access Control) affecting Keycloak services libraries in the Maven ecosystem. The issue involves keycloak account resources user lookup contains broken access control. Remediation is available by upgrading affected packages to version 26.4.12, 26.6.2.
CVE-2026-37981 at a Glance
Security Impact
CVSS: 4.3
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N).
How to Fix CVE-2026-37981
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>26.4.12</version>
</dependency><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-2026-37981, 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 26.4.12), 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-1220: Insufficient Granularity of Access Control, where the product implements access controls via a policy or other feature with the intention to disable or restrict accesses (reads and/or writes) to assets in a system from untrusted agents. however, implemented access controls lack required granularity, which renders the control policy too broad because it allows accesses from unauthorized agents to the security-sensitive assets. 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-2026-37981 Affected Keycloak services Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.keycloak:keycloak-services
|
Maven |
< 26.4.12
|
26.4.12
|
|
org.keycloak:keycloak-services
|
Maven |
≥ 26.5.0
< 26.6.2
|
26.6.2
|
References
Frequently Asked Questions
What is CVE-2026-37981?
Which Keycloak services versions are affected?
What version fixes CVE-2026-37981?
Is keycloak-services affected?
What is the CVSS score of CVE-2026-37981?
What CWE is associated with CVE-2026-37981?
How can I check Maven dependencies for CVE-2026-37981?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-933f-rg6j-f46p",
"modified" : "2026-06-30T19:15:26Z",
"published" : "2026-05-19T12:31:40Z",
"aliases" : [ "CVE-2026-37981" ],
"summary" : "Keycloak Account Resources user lookup contains broken access control",
"details" : "Keycloak's Account Resources user lookup endpoint allows a remote authenticated user, who owns at least one User-Managed Access (UMA) resource, to enumerate and harvest personally identifiable information (PII) for all realm users. By sending crafted requests with arbitrary usernames or email values, the endpoint returns full profile objects for unrelated users. This leads to broad profile-level information disclosure.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.keycloak:keycloak-services"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "26.4.12"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Maven",
"name" : "org.keycloak:keycloak-services"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "26.5.0"
}, {
"fixed" : "26.6.2"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-37981"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/issues/49116"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/pull/49122"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/commit/33f6f873fda2c9546e52d34b4f865eafc42df0c0"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/commit/b68070bcf96a6fe7d0f01cee5d3cbde71f2abbe7"
}, {
"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-2026-37981"
}, {
"type" : "WEB",
"url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2455326"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/keycloak/keycloak"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-1220" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-06-30T19:15:26Z",
"nvd_published_at" : "2026-05-19T12:16:18Z"
}
}