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Vulnerability record · CVE-2023-0264 · published 4 August 2023

CVE-2023-0264: Redhat keycloak improper authentication vulnerability

Redhat · Keycloak

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.

5.0 CVSS 3.1 Medium EPSS 1.3% · top 31.2% CWE-287 · Improper authentication
5.0CVSS 3.1 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

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

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2023-0264), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.