Unauthorized organization registration via unsigned invitation tokens
Published Feb 9, 2026 · Updated Feb 9, 2026
Authentication bypass in Red Hat build of Keycloak 26.2 and 26.4 allows remote authenticated users to join unauthorized organizations. The organization-registration flow parses invitation JWT payload claims without verifying the cryptographic signature, so altered org_id and eml values are trusted. Exploitation requires a legitimate invitation token and an organization-enabled realm; successful registration grants membership and its associated access in the selected organization.
Summary
What happened
Authentication bypass in Red Hat build of Keycloak 26.2 and 26.4 allows remote authenticated users to join unauthorized organizations. The organization-registration flow parses invitation JWT payload claims without verifying the cryptographic signature, so altered org_id and eml values are trusted. Exploitation requires a legitimate invitation token and an organization-enabled realm; successful registration grants membership and its associated access in the selected organization.
The record
- CVE
- CVE-2026-1529
- Published
- Feb 9, 2026
- Updated
- Feb 9, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat build of Keycloak
- Classifications
- CWE-347, T1136
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 9, 2026CVE publishedPublication date reported by the CVE source.
- Feb 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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