Unauthorized access via domain-derived organization claims
Published Feb 17, 2025 · Updated May 6, 2026
Improper authorization in Keycloak 26.0.0 through 26.0.9 allows remote authenticated users to gain access through false organization claims. The organization membership mapper derives the token claim from a matching username or email domain even when the subject has no membership in that organization. Exploitation requires an organization-enabled realm, an applicable client scope, and a matching account identifier; impact occurs only when a relying application authorizes access from the claim.
Summary
What happened
Improper authorization in Keycloak 26.0.0 through 26.0.9 allows remote authenticated users to gain access through false organization claims. The organization membership mapper derives the token claim from a matching username or email domain even when the subject has no membership in that organization. Exploitation requires an organization-enabled realm, an applicable client scope, and a matching account identifier; impact occurs only when a relying application authorizes access from the claim.
The record
- CVE
- CVE-2025-1391
- Published
- Feb 17, 2025
- Updated
- May 6, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat build of Keycloak
- Classifications
- CWE-284
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 17, 2025CVE publishedPublication date reported by the CVE source.
- May 6, 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?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Wrong organization claim assignment in JWT access token reproductionproof of concept · unverified
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Technologies
Your stack
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Your stack
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