CVE-2026-9689: Keycloak services Keycloak Services Has Improper Validation Vulnerability
MODERATECVE-2026-9689 is a MODERATE (CVSS 4.2) keycloak services has improper validation vulnerability (CWE-1288: Improper Validation of Consistency within Input) affecting Keycloak services libraries in the Maven ecosystem. The issue involves keycloak services has improper validation of consistency within input. Remediation is available in the latest vendor maintenance releases.
CVE-2026-9689 at a Glance
Security Impact
CVSS: 4.2
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N).
How to Fix CVE-2026-9689
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>Latest secure release</version>
</dependency><dependency>
<groupId>org.keycloak</groupId>
<artifactId>keycloak-services</artifactId>
<version>Latest secure release</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-2026-9689, 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 the patched release), 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-1288: Improper Validation of Consistency within Input, where the product receives a complex input with multiple elements or fields that must be consistent with each other, but it does not validate or incorrectly validates that the input is actually consistent. 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-2026-9689 Affected Keycloak services Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.keycloak:keycloak-services
|
Maven |
≥ 26.5.0
≤ 26.6.4
|
|
|
org.keycloak:keycloak-services
|
Maven |
≤ 26.4.7
|
|
References
Frequently Asked Questions
What is CVE-2026-9689?
Which Keycloak services versions are affected?
What version fixes CVE-2026-9689?
Is keycloak-services affected?
What is the CVSS score of CVE-2026-9689?
What CWE is associated with CVE-2026-9689?
How can I check Maven dependencies for CVE-2026-9689?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-wcvj-vpvw-9rr5",
"modified" : "2026-08-05T18:31:20Z",
"published" : "2026-05-27T12:31:24Z",
"aliases" : [ "CVE-2026-9689" ],
"summary" : "Keycloak Services has Improper Validation of Consistency within Input",
"details" : "A flaw was found in Keycloak, an open-source identity and access management solution. When a client application is configured to accept broad redirect Uniform Resource Identifiers (URIs), a remote attacker can manipulate the authentication process by crafting a special web address. If a user clicks this link, the client application might incorrectly prioritize attacker-controlled information over legitimate data. This vulnerability, known as HTTP parameter pollution, could allow an attacker to bypass security measures or gain unauthorized access to resources.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.keycloak:keycloak-services"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "26.5.0"
}, {
"last_affected" : "26.6.4"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Maven",
"name" : "org.keycloak:keycloak-services"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"last_affected" : "26.4.7"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-9689"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/issues/49430"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/pull/49959"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/commit/18832bcae5bebd5a1d66c2ec5fcd640e576fa625"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/commit/1f58a4b79a258bcf2ef86b58fbf0016cdb91291f"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/commit/267a1a33d4dc1eac7622614ba9772b4e1e35726f"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:50846"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:50847"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:50848"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:50849"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/security/cve/CVE-2026-9689"
}, {
"type" : "WEB",
"url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2481845"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/keycloak/keycloak"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-1288" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-07-01T18:54:49Z",
"nvd_published_at" : "2026-05-27T12:17:15Z"
}
}