CVE-2026-9794: Keycloak services Keycloak Generates An Error Message Vulnerability
MODERATECVE-2026-9794 is a MODERATE (CVSS 5.3) keycloak generates an error message vulnerability (CWE-209: Generation of Error Message Containing Sensitive Information) affecting Keycloak services libraries in the Maven ecosystem. The issue involves keycloak generates an error message containing sensitive information. Remediation is available by upgrading affected packages to version 26.6.3.
CVE-2026-9794 at a Glance
Security Impact
CVSS: 5.3
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:N/S:U/C:L/I:N/A:N).
How to Fix CVE-2026-9794
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>26.6.3</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-2026-9794, 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 26.6.3), 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-209: Generation of Error Message Containing Sensitive Information, where the product generates an error message that includes sensitive information about its environment, users, or associated 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-2026-9794 Affected Keycloak services Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.keycloak:keycloak-services
|
Maven |
≤ 26.4.7
|
|
|
org.keycloak:keycloak-services
|
Maven |
≥ 26.5.0
< 26.6.3
|
26.6.3
|
References
Frequently Asked Questions
What is CVE-2026-9794?
Which Keycloak services versions are affected?
What version fixes CVE-2026-9794?
Is keycloak-services affected?
What is the CVSS score of CVE-2026-9794?
What CWE is associated with CVE-2026-9794?
How can I check Maven dependencies for CVE-2026-9794?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-fqjh-8322-vgrv",
"modified" : "2026-07-01T21:24:01Z",
"published" : "2026-05-28T06:31:09Z",
"aliases" : [ "CVE-2026-9794" ],
"summary" : "Keycloak Generates an Error Message Containing Sensitive Information",
"details" : "A flaw was found in Keycloak. A remote, unauthenticated attacker can exploit this vulnerability by sending specially crafted SOAP requests to the SAML ECP (Security Assertion Markup Language Enhanced Client or Proxy) endpoint with varying client IDs. By observing distinct faultstrings in the responses, the attacker can determine the client's protocol type, leading to information disclosure.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/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"
}, {
"last_affected" : "26.4.7"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Maven",
"name" : "org.keycloak:keycloak-services"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "26.5.0"
}, {
"fixed" : "26.6.3"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-9794"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/issues/49428"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/pull/49684"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/pull/49686"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/commit/05e98366773eec60878bb2a6d5da6bc7048ac3c8"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/commit/7750e3ff823d1da8580d42c51194feb2e933b87b"
}, {
"type" : "WEB",
"url" : "https://github.com/keycloak/keycloak/commit/dba79eb03fb9d634fda5e86e1613b8747f968518"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:25097"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:25098"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:30049"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:30050"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/security/cve/CVE-2026-9794"
}, {
"type" : "WEB",
"url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2482461"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/keycloak/keycloak"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-209" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-07-01T21:24:01Z",
"nvd_published_at" : "2026-05-28T05:16:40Z"
}
}