What’s Vulnerable › Vulnerabilities

CVE-2023-0264

• Severity: medium (CVSS 5.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-08-04 · updated 2026-06-17
• Weakness: CWE-287

Description

A flaw was found in Keycloaks OpenID Connect user authentication, which may incorrectly authenticate requests. An authenticated attacker who could obtain information from a user request within the same realm could use that data to impersonate the victim and generate new session tokens. This issue could impact confidentiality, integrity, and availability.

Affected products

• Keycloak: before 18.0.6 — fixed in 18.0.6
• Red Hat OpenShift Container Platform 4.18: 4.9, 4.10
• RedHat Openshift Container Platform For Ibm Linuxone: 4.9, 4.10
• RedHat Openshift Container Platform Ibm Z Systems: 4.9, 4.10
• Red Hat Single Sign-On: before 7.6.2 — fixed in 7.6.2

How to fix

Upgrade to a fixed version: Keycloak 18.0.6; Red Hat Single Sign-On 7.6.2. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/security/cve/CVE-2023-0264
• https://access.redhat.com/security/cve/CVE-2023-0264

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