CVE-2026-9791: Keycloak server spi private Keycloak Vulnerable To Incorrect Authorization Vulnerability

Q: What is CVE-2026-9791?

CVE-2026-9791 is a security vulnerability in Keycloak server spi private involving Keycloak Vulnerable to Incorrect Authorization under CWE-863: Incorrect Authorization.

Q: Which Keycloak server spi private versions are affected?

Affected versions include releases prior to 26.6.3 across affected packages: org.keycloak:keycloak-server-spi-private, org.keycloak:keycloak-services.

Q: What version fixes CVE-2026-9791?

Upgrading to 26.6.3 (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is keycloak-server-spi-private affected?

Yes, org.keycloak:keycloak-server-spi-private is affected in releases prior to 26.6.3, Latest secure release. Upgrade your dependency to 26.6.3, Latest secure release or later.

Q: Is keycloak-services affected?

Yes, org.keycloak:keycloak-services is affected in releases prior to 26.6.3, Latest secure release. Upgrade your dependency to 26.6.3, Latest secure release or later.

Q: What is the CVSS score of CVE-2026-9791?

CVE-2026-9791 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Q: What CWE is associated with CVE-2026-9791?

CVE-2026-9791 is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).

Q: How can I check Maven dependencies for CVE-2026-9791?

Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.keycloak'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

MODERATE

Advisory Identifier: GHSA-4q93-v92x-p89f

CVSS 4.3

CWE-863

Published 2026-05-28

Advisory Summary

CVE-2026-9791 is a MODERATE (CVSS 4.3) keycloak vulnerable to incorrect authorization vulnerability (CWE-863: Incorrect Authorization) affecting Keycloak server spi private libraries in the Maven ecosystem. The issue involves keycloak vulnerable to incorrect authorization. Remediation is available by upgrading affected packages to version 26.6.3.

CVE-2026-9791 at a Glance

CVE Identifier CVE-2026-9791

GHSA Identifier GHSA-4q93-v92x-p89f

Severity MODERATE

CVSS v3.1 Base Score 4.3

CWE Classification CWE-863: Incorrect Authorization

Affected Product Keycloak server spi private

Package Ecosystem Maven

Published Date 2026-05-28

Last Updated 2026-07-01

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).

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required Low (PR:L)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality Low (C:L)

Integrity None (I:N)

Availability None (A:N)

How to Fix CVE-2026-9791

To remediate this vulnerability, upgrade all affected Keycloak server spi private dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.keycloak:keycloak-server-spi-private fixed: 26.6.3

<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-server-spi-private</artifactId>
    <version>26.6.3</version>
</dependency>

org.keycloak:keycloak-services fixed: 26.6.3

<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-services</artifactId>
    <version>26.6.3</version>
</dependency>

org.keycloak:keycloak-server-spi-private fixed: Latest secure release

<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-server-spi-private</artifactId>
    <version>Latest secure release</version>
</dependency>

org.keycloak:keycloak-services fixed: Latest secure release

<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-services</artifactId>
    <version>Latest secure release</version>
</dependency>

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

mvn dependency:tree -Dincludes=org.keycloak

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-9791, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.keycloak

Analyze the terminal output to locate any version of Keycloak server spi private 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-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. In Keycloak server spi private, 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

A flaw was found in Keycloak. An authenticated user with existing organization membership can exploit this flaw by accessing user-facing APIs, such as the account API or by requesting an OpenID Connect (OIDC) token with the 'organization' scope. This allows organization metadata to be disclosed in tokens, even after an administrator has explicitly disabled the Organizations feature, potentially leading to incorrect authorization decisions by resource servers.

CVE-2026-9791 Affected Keycloak server spi private Versions

4 component(s)

Fixed Versions:

26.6.3

Product / Package	Ecosystem	Affected Versions	Fixed Version
org.keycloak:keycloak-server-spi-private maven/org.keycloak/keycloak-server-spi-private	Maven	≥ 26.5.0 < 26.6.3	26.6.3
org.keycloak:keycloak-services maven/org.keycloak/keycloak-services	Maven	≥ 26.5.0 < 26.6.3	26.6.3
org.keycloak:keycloak-server-spi-private maven/org.keycloak/keycloak-server-spi-private	Maven	≤ 26.4.7
org.keycloak:keycloak-services maven/org.keycloak/keycloak-services	Maven	≤ 26.4.7

References

NVD — CVE-2026-9791 NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-9791

Keycloak server spi private Source Repository REPOSITORY

https://github.com/keycloak/keycloak/issues/49431

Keycloak server spi private Source Repository REPOSITORY

https://github.com/keycloak/keycloak/pull/49541

Keycloak server spi private Source Repository REPOSITORY

https://github.com/keycloak/keycloak/pull/49678

Keycloak server spi private Source Repository REPOSITORY

https://github.com/keycloak/keycloak/pull/49680

Security Fix Commit FIX COMMIT

https://github.com/keycloak/keycloak/commit/0e706e7c83d1e971b48656ad9e674eec6adc225b

Security Fix Commit FIX COMMIT

https://github.com/keycloak/keycloak/commit/a77c60f2f3e0793046add44120579871e92553df

Security Fix Commit FIX COMMIT

https://github.com/keycloak/keycloak/commit/f19e1f2b4e998116d4e321f50ecf99c0f87b862f

access.redhat.com/errata/rhsa-2026:25... WEB

https://access.redhat.com/errata/RHSA-2026:25097

access.redhat.com/errata/rhsa-2026:25... WEB

https://access.redhat.com/errata/RHSA-2026:25098

access.redhat.com/errata/rhsa-2026:30... WEB

https://access.redhat.com/errata/RHSA-2026:30049

access.redhat.com/errata/rhsa-2026:30... WEB

https://access.redhat.com/errata/RHSA-2026:30050

Keycloak server spi private Security Information SECURITY

https://access.redhat.com/security/cve/CVE-2026-9791

bugzilla.redhat.com/show_bug.cgi WEB

https://bugzilla.redhat.com/show_bug.cgi?id=2482458

Keycloak server spi private Source Repository REPOSITORY

https://github.com/keycloak/keycloak

Frequently Asked Questions

What is CVE-2026-9791?

CVE-2026-9791 is a security vulnerability in Keycloak server spi private involving Keycloak Vulnerable to Incorrect Authorization under CWE-863: Incorrect Authorization.

Which Keycloak server spi private versions are affected?

Affected versions include releases prior to 26.6.3 across affected packages: org.keycloak:keycloak-server-spi-private, org.keycloak:keycloak-services.

What version fixes CVE-2026-9791?

Upgrading to 26.6.3 (or the latest patched release for your respective branch) resolves the vulnerability.

Is keycloak-server-spi-private affected?

Yes, org.keycloak:keycloak-server-spi-private is affected in releases prior to 26.6.3, Latest secure release. Upgrade your dependency to 26.6.3, Latest secure release or later.

Is keycloak-services affected?

Yes, org.keycloak:keycloak-services is affected in releases prior to 26.6.3, Latest secure release. Upgrade your dependency to 26.6.3, Latest secure release or later.

What is the CVSS score of CVE-2026-9791?

CVE-2026-9791 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

What CWE is associated with CVE-2026-9791?

CVE-2026-9791 is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).

How can I check Maven dependencies for CVE-2026-9791?

Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.keycloak'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

Machine-readable OSV JSON OSV v1.5 Schema

Normalized schema output

View Raw JSON

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-4q93-v92x-p89f",
  "modified" : "2026-07-01T21:16:48Z",
  "published" : "2026-05-28T06:31:09Z",
  "aliases" : [ "CVE-2026-9791" ],
  "summary" : "Keycloak Vulnerable to Incorrect Authorization",
  "details" : "A flaw was found in Keycloak. An authenticated user with existing organization membership can exploit this flaw by accessing user-facing APIs, such as the account API or by requesting an OpenID Connect (OIDC) token with the 'organization' scope. This allows organization metadata to be disclosed in tokens, even after an administrator has explicitly disabled the Organizations feature, potentially leading to incorrect authorization decisions by resource servers.",
  "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-server-spi-private"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "26.5.0"
      }, {
        "fixed" : "26.6.3"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.keycloak:keycloak-services"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "26.5.0"
      }, {
        "fixed" : "26.6.3"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.keycloak:keycloak-server-spi-private"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "26.4.7"
      } ]
    } ]
  }, {
    "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-2026-9791"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/issues/49431"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/pull/49541"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/pull/49678"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/pull/49680"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/commit/0e706e7c83d1e971b48656ad9e674eec6adc225b"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/commit/a77c60f2f3e0793046add44120579871e92553df"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/commit/f19e1f2b4e998116d4e321f50ecf99c0f87b862f"
  }, {
    "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-2026-9791"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2482458"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/keycloak/keycloak"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-01T21:16:47Z",
    "nvd_published_at" : "2026-05-28T05:16:39Z"
  }
}

CVSS V3

4.3 MODERATE

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required Low (PR:L)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality Low (C:L)

Integrity None (I:N)

Availability None (A:N)

Vector String

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Advisory Metadata

Source ID: GHSA-4q93-v92x-p89f
Schema Version: 1.4.0
Published: 2026-05-28 06:31
Last Modified: 2026-07-01 21:16
Database Record File: advisories/github-reviewed/2026/05/GHSA-4q93-v92x-p89f/GHSA-4q93-v92x-p89f.json