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Keycloak's improper input validation allows using email as username

Low severity GitHub Reviewed Published Jun 12, 2024 in keycloak/keycloak • Updated Dec 20, 2024

Package

maven org.keycloak:keycloak-services (Maven)

Affected versions

< 24.0.1

Patched versions

24.0.1

Description

Keycloak allows the use of email as a username and doesn't check that an account with this email already exists. That could lead to the unability to reset/login with email for the user. This is caused by usernames being evaluated before emails.

References

@abstractj abstractj published to keycloak/keycloak Jun 12, 2024
Published to the GitHub Advisory Database Jun 12, 2024
Reviewed Jun 12, 2024
Last updated Dec 20, 2024

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS score

0.089%
(40th percentile)

Weaknesses

CVE ID

CVE-2021-3754

GHSA ID

GHSA-4vc8-pg5c-vg4x

Source code

Credits

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