Email verification bypass via mismatched OIDC claims
Published Jul 5, 2026 · Updated Jul 5, 2026
Improper claim validation in Red Hat build of Keycloak allows remote attackers to mark arbitrary email addresses as verified. The OIDC broker takes the email from the userinfo response but blindly applies email_verified=true from the ID token without confirming that both claims describe the same address. Exploitation requires non-default trustEmail=true with userinfo enabled and a malicious or compromised upstream provider, enabling verification-workflow bypass and account takeover where applications link accounts solely by verified email.
Summary
What happened
Improper claim validation in Red Hat build of Keycloak allows remote attackers to mark arbitrary email addresses as verified. The OIDC broker takes the email from the userinfo response but blindly applies email_verified=true from the ID token without confirming that both claims describe the same address. Exploitation requires non-default trustEmail=true with userinfo enabled and a malicious or compromised upstream provider, enabling verification-workflow bypass and account takeover where applications link accounts solely by verified email.
The record
- CVE
- CVE-2026-14781
- Published
- Jul 5, 2026
- Updated
- Jul 5, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat build of Keycloak
- Classifications
- CWE-1288, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 5, 2026CVE publishedPublication date reported by the CVE source.
- Jul 5, 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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