CVE-2026-1529
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JWT Manipulation in Keycloak Enables Unauthorized Organization Access

Publication date: 2026-02-09

Last updated on: 2026-02-10

Assigner: Red Hat, Inc.

Description
A flaw was found in Keycloak. An attacker can exploit this vulnerability by modifying the organization ID and target email within a legitimate invitation token's JSON Web Token (JWT) payload. This lack of cryptographic signature verification allows the attacker to successfully self-register into an unauthorized organization, leading to unauthorized access.
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Meta Information
Published
2026-02-09
Last Modified
2026-02-10
Generated
2026-06-16
AI Q&A
2026-02-09
EPSS Evaluated
2026-06-14
NVD
CVE-2026-1529
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
keycloak keycloak *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-347 The product does not verify, or incorrectly verifies, the cryptographic signature for data.
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Executive Summary

This vulnerability exists in Keycloak and involves an attacker modifying the organization ID and target email within a legitimate invitation token's JSON Web Token (JWT) payload.

Because the system does not verify the cryptographic signature of the JWT payload, the attacker can alter these values and successfully self-register into an organization they are not authorized to join.

This flaw allows unauthorized access by bypassing intended access controls.

Impact Analysis

The vulnerability can lead to unauthorized access to organizations within Keycloak by allowing attackers to self-register into organizations without proper authorization.

This unauthorized access can compromise confidentiality and integrity of organizational data and resources.

Given the CVSS score of 8.1, the impact is considered high in terms of confidentiality and integrity.

Compliance Impact

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Detection Guidance

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Mitigation Strategies

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