CVE-2023-0264

Name: CVE-2023-0264
Creator: NVD / NIST
Published: 2023-08-04T18:15:11.09+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5/10EPSS 1.27%

Last modified Jun 17, 2026

CVE-2023-0264 is a medium-severity vulnerability rated 5/10 on the CVSS scale. 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. EPSS estimates a 1.27% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5/10

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

EPSS Probability

1.27%

66.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Redhat	Keycloak	< 18.0.6
Redhat	Single Sign-On	< 7.6.2
Redhat	Openshift Container Platform	4.9
Redhat	Openshift Container Platform	4.10
Redhat	Openshift Container Platform For Ibm Linuxone	4.9
Redhat	Openshift Container Platform For Ibm Linuxone	4.10
Redhat	Openshift Container Platform Ibm Z Systems	4.9
Redhat	Openshift Container Platform Ibm Z Systems	4.10
Redhat	Single Sign-On	All versions

References

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

Timeline

Published: Aug 4, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-0264?

How severe is CVE-2023-0264?

CVE-2023-0264 has a CVSS score of 5/10 (MEDIUM severity). The EPSS model estimates a 1.27% probability of exploitation in the next 30 days.

How do I fix CVE-2023-0264?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-0264?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST