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Fencer Vulns
medium 5.0

CVE-2023-0264 json

Keycloak vulnerable to user impersonation via stolen UUID code

published 2023-03-02 3 y ago modified 2026-09-10 1 mo ago also GHSA-9g98-5mj6-f9mv , EUVD-2023-0967

cvss
5.0
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.keycloak:keycloak-services 21.0.1
  • redhat keycloak 18.0.6
  • redhat single_sign-on 7.6.2
  • rh-sso7-keycloak red hat single sign on 7.6 18.0.6-1.redhat_00001.1.el7sso
  • rh-sso7-keycloak-server red hat single sign on 7.6 18.0.6-1.redhat_00001.1.el7sso
  • rh-sso7-keycloak red hat single sign on 7.6 18.0.6-1.redhat_00001.1.el8sso
  • rh-sso7-keycloak-server red hat single sign on 7.6 18.0.6-1.redhat_00001.1.el8sso
  • rh-sso7-keycloak red hat single sign on 7.6 18.0.6-1.redhat_00001.1.el9sso
  • rh-sso7-keycloak-server red hat single sign on 7.6 18.0.6-1.redhat_00001.1.el9sso

red hat advisories RHSA-2023:1043RHSA-2023:1044RHSA-2023:1045

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-0264 updated cvss 4.6

keycloak: user impersonation via stolen uuid code

  • Red Hat Middleware Containers for OpenShift rh-sso-7/sso76-openshift-rhel8 7.6-20
    fixed: vendor fix RHSA-2023:1047
  • Red Hat Single Sign-On 7
    fixed: vendor fix RHSA-2023:1049
  • Red Hat Single Sign-On 7.6 for RHEL 7 Server rh-sso7-keycloak 18.0.6-1.redhat_00001.1.el7sso, rh-sso7-keycloak-server 18.0.6-1.redhat_00001.1.el7sso
    fixed: vendor fix RHSA-2023:1043
  • Red Hat Single Sign-On 7.6 for RHEL 8 rh-sso7-keycloak 18.0.6-1.redhat_00001.1.el8sso, rh-sso7-keycloak-server 18.0.6-1.redhat_00001.1.el8sso
    fixed: vendor fix RHSA-2023:1044
  • Red Hat Single Sign-On 7.6 for RHEL 9 rh-sso7-keycloak 18.0.6-1.redhat_00001.1.el9sso, rh-sso7-keycloak-server 18.0.6-1.redhat_00001.1.el9sso
    fixed: vendor fix RHSA-2023:1045
  • Red Hat A-MQ Online keycloak-services Red Hat JBoss Enterprise Application Platform 6 keycloak-services
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.27% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.0 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
GitHub 3.1 8.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
maven org.keycloak:keycloak-services
<21.0.1
21.0.1

Affected products

  • redhat.com Keycloak

Classification

Weakness
  • CWE-287 Improper Authentication
  • CWE-345 Insufficient Verification of Data Authenticity

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.