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Vulnerabilities

Vulnerability · CVE-2023-1664

CVE-2023-1664 is listed by A flaw was found in Keycloak..

Published May 26, 2023 · catalog updated Jun 17, 2026 · single sign-on

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-2023-1664. EPSS is 0.43%. Act only if a listed version of single sign-on is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.43%
Remediation
Not established
Affected products
cpe redhat/build of quarkus · cpe redhat/jboss a-mq · cpe redhat/keycloak · cpe redhat/migration toolkit for runtimes · cpe redhat/single sign-on

CVE-2023-1664 is listed by A flaw was found in Keycloak..

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/build of quarkusversion unspecified
  • cpe redhat/jboss a-mq7
  • cpe redhat/keycloakversion unspecified
  • cpe redhat/migration toolkit for runtimesversion unspecified
  • cpe redhat/single sign-on7.0

How to fix CVE-2023-1664

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-2023-1664. EPSS is 0.43%. Act only if a listed version of single sign-on is installed.

Which versions are affected?

Compare what you have installed with redhat/jboss a-mq 7; redhat/single sign-on 7.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-295: Improper Certificate Validation. EPSS 0.43%. 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. May 26, 2023 · Monitored products — high

    Detected

    CVE-2023-1664 is listed by A flaw was found in Keycloak..

  2. Jun 17, 2026 · Monitored products — high

    Updated

    CVE-2023-1664 is listed by A flaw was found in Keycloak..

Sources

  • CVE.orgVulnerability recordCVE-2023-1664

    Official CVE identifier

    cve.org
  • Monitored products — highVendor advisoryCVE-2023-1664

    A flaw was found in Keycloak. This flaw depends on a non-default configuration "Revalidate Client Certificate" to be enabled and the reverse proxy is not validating the certificate before Keycloak. Using this method an attacker may choose the certificate which will be validated by the server. If this happens and the KC_SPI_TRUSTSTORE_FILE_FILE variable is missing/misconfigured, any trustfile may b

    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