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Vulnerabilities

Security incident · CVE-2023-0264

A flaw was found in Keycloaks OpenID Connect user authentication, which may incorrectly authenticate requests.

Published Aug 4, 2023 · catalog updated Jun 17, 2026 · A flaw was found

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2023-0264. EPSS is 1.27%. Act only if a listed version of A flaw was found is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A flaw was found).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.27%
Remediation
Version ranges on file
Affected products
cpe redhat/keycloak · cpe redhat/openshift container platform · cpe redhat/openshift container platform for ibm linuxone · cpe redhat/single sign-on

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe redhat/keycloak< 18.0.6
  • cpe redhat/openshift container platform4.10
  • cpe redhat/openshift container platform4.9
  • cpe redhat/openshift container platform for ibm linuxone4.10
  • cpe redhat/openshift container platform for ibm linuxone4.9
  • cpe redhat/single sign-on< 7.6.2

How to fix CVE-2023-0264

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2023-0264. EPSS is 1.27%. Act only if a listed version of A flaw was found is installed.

Which versions are affected?

Compare what you have installed with redhat/openshift container platform 4.10; redhat/openshift container platform 4.9; redhat/openshift container platform for ibm linuxone 4.10; redhat/openshift container platform for ibm linuxone 4.9. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-287: Improper Authentication. EPSS 1.27%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Keycloak security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 4, 2023 · Monitored products — high

    Detected

    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.

  2. Jun 17, 2026 · Monitored products — high

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2023-0264

    Official CVE identifier

    cve.org
  • Monitored products — highVendor advisoryCVE-2023-0264

    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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 4, 2026
  • Monitored products — highNov 3, 2026