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CVE-2023-0105

Keycloak: Impersonation and lockout possible through incorrect handling of email trust

6.5 MediumFix available

A flaw was found in Keycloak. This flaw allows impersonation and lockout due to the email trust not being handled correctly in Keycloak. An attacker can shadow other users with the same email and lockout or impersonate them.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
Low

Exploit likelihood

0.72%Down 0.2 points since Jan 13, 2023
90%50%10%1%

What each source reports

NVD Score used 6.5

A flaw was found in Keycloak. This flaw allows impersonation and lockout due to the email trust not being handled correctly in Keycloak. An attacker can shadow other users with the same email and lockout or impersonate them.

Record
CVE-2023-0105
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-287
Updated
2026-11-02
CVE List 6.5

A flaw was found in Keycloak. This flaw allows impersonation and lockout due to the email trust not being handled correctly in Keycloak. An attacker can shadow other users with the same email and lockout or impersonate them.

Record
CVE-2023-0105
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-287
Updated
2026-11-02
EUVDEUVD-2023-2025 6.5

A flaw was found in Keycloak. This flaw allows impersonation and lockout due to the email trust not being handled correctly in Keycloak. An attacker can shadow other users with the same email and lockout or impersonate them.

Record
EUVD-2023-2025
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-c7xw-p58w-h6fj 6.5

Keycloak: Impersonation and lockout possible through incorrect handling of email trust

Impersonation and lockout are possible due to email trust not being handled correctly in Keycloak. Since the verified state is not reset when the email changes, it is possible for users to shadow others with the same email and lock out or impersonate them.

Record
GHSA-c7xw-p58w-h6fj
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-287, CWE-841
Updated
2026-11-02
OSVGHSA-c7xw-p58w-h6fj 6.5

Keycloak: Impersonation and lockout possible through incorrect handling of email trust

Impersonation and lockout are possible due to email trust not being handled correctly in Keycloak. Since the verified state is not reset when the email changes, it is possible for users to shadow others with the same email and lock out or impersonate them.

Record
GHSA-c7xw-p58w-h6fj
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-287, CWE-841
Updated
2026-11-02
OSVRHSA-2023:7482 7.5

Red Hat Security Advisory: Red Hat Single Sign-On 7.6.6 security update on RHEL 7

Record
RHSA-2023:7482
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2023:7483 7.5

Red Hat Security Advisory: Red Hat Single Sign-On 7.6.6 security update on RHEL 8

Record
RHSA-2023:7483
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2023:7484 7.5

Red Hat Security Advisory: Red Hat Single Sign-On 7.6.6 security update on RHEL 9

Record
RHSA-2023:7484
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
org.keycloak:keycloak-core
Maven
 before 22.0.1
22.0.1
org.keycloak:keycloak-core
Maven
 before 22.0.1, plus listed versions
1.0-alpha-11.0-alpha-1-120620131.0-alpha-21.0-alpha-31.0-alpha-4
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1.0-beta-11.0-beta-1-201505211.0-beta-1-201505231.0-beta-21.0-beta-31.0-beta-41.0-final1.0-rc-11.0-rc-21.0.1.Final1.0.2.Final1.0.3.Final1.0.4.Final1.0.5.Final1.1.0.Beta11.1.0.Beta21.1.0.Final1.1.1.Final1.2.0.Beta11.2.0.CR11.2.0.Final1.3.0.Final1.3.1.Final1.4.0.Final1.5.0-Final1.5.0.Final1.5.1.Final1.6.0.Final1.6.1.Final1.7.0.CR11.7.0.Final1.8.0.Alpha11.8.0.CR11.8.0.CR21.8.0.CR31.8.0.Final1.8.1.Final1.9.0.CR11.9.0.Final1.9.1.Final1.9.2.Final1.9.3.Final1.9.4.Final1.9.5.Final1.9.7.Final
22.0.1
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7.6::el7
From an advisory covering 3 CVEs
 before 0:18.0.11-2.redhat_00001.1.el7sso
0:18.0.11-2.redhat_00001.1.el7sso
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7.6::el7
From an advisory covering 3 CVEs
 before 0:18.0.11-2.redhat_00001.1.el7sso
0:18.0.11-2.redhat_00001.1.el7sso
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7.6::el8
From an advisory covering 3 CVEs
 before 0:18.0.11-2.redhat_00001.1.el8sso
0:18.0.11-2.redhat_00001.1.el8sso
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7.6::el8
From an advisory covering 3 CVEs
 before 0:18.0.11-2.redhat_00001.1.el8sso
0:18.0.11-2.redhat_00001.1.el8sso
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7.6::el9
From an advisory covering 3 CVEs
 before 0:18.0.11-2.redhat_00001.1.el9sso
0:18.0.11-2.redhat_00001.1.el9sso
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7.6::el9
From an advisory covering 3 CVEs
 before 0:18.0.11-2.redhat_00001.1.el9sso
0:18.0.11-2.redhat_00001.1.el9sso

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-0105 is a medium vulnerability (CVSS 6.5) in Keycloak, published January 11, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.72%, the 54th percentile. Fixed in org.keycloak:keycloak-core 22.0.1.

References

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