What’s Vulnerable › Vulnerabilities

CVE-2023-0657: Keycloak: impersonation via logout token exchange

• Severity: low (CVSS 3.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-11-17 · updated 2026-06-17
• Weakness: CWE-273

Description

A flaw was found in Keycloak. This issue occurs due to improperly enforcing token types when validating signatures locally. This could allow an authenticated attacker to exchange a logout token for an access token and possibly gain access to data outside of enforced permissions.

Affected products

• Red Hat build of Keycloak 22: all versions — fixed in 22-13, 22-16, 22.0.10-1
• Red Hat Single Sign-On 7: all versions

How to fix

Upgrade to a fixed version: Red Hat build of Keycloak 22 22-13, 22-16, 22.0.10-1. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2024:1867
• https://access.redhat.com/errata/RHSA-2024:1868
• https://access.redhat.com/security/cve/CVE-2023-0657
• https://bugzilla.redhat.com/show_bug.cgi?id=2166728

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