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Fencer Vulns
high 7.5

CVE-2024-4540 json

Keycloak: exposure of sensitive information in pushed authorization requests (par) kc_restart cookie

published 2024-06-03 2 y ago modified 2026-10-09 30 d ago also GHSA-69fp-7c8p-crjr , EUVD-2024-1945

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 46%
public exploits
0
none known

Summary

A flaw was found in Keycloak in OAuth 2.0 Pushed Authorization Requests (PAR). Client-provided parameters were found to be included in plain text in the KC_RESTART cookie returned by the authorization server's HTTP response to a `request_uri` authorization request, possibly leading to an information disclosure vulnerability.

Patch / fix

  • maven org.keycloak:keycloak-services 24.0.5
  • Red Hat Red Hat build of Keycloak 22 22-15, 22-18, 22.0.11-2
  • Red Hat Red Hat build of Keycloak 24 24-10, 24.0.5-2
  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 7 0:18.0.14-1.redhat_00001.1.el7sso
  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 8 0:18.0.14-1.redhat_00001.1.el8sso
  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 9 0:18.0.14-1.redhat_00001.1.el9sso
  • Red Hat RHEL-8 based Middleware Containers 7.6-49
  • rh-sso7-keycloak red hat single sign on 7.6 18.0.14-1.redhat_00001.1.el9sso
  • rh-sso7-keycloak-server red hat single sign on 7.6 18.0.14-1.redhat_00001.1.el9sso
  • rh-sso7-keycloak red hat single sign on 7.6 18.0.14-1.redhat_00001.1.el8sso
  • rh-sso7-keycloak-server red hat single sign on 7.6 18.0.14-1.redhat_00001.1.el8sso
  • rh-sso7-keycloak red hat single sign on 7.6 18.0.14-1.redhat_00001.1.el7sso
  • rh-sso7-keycloak-server red hat single sign on 7.6 18.0.14-1.redhat_00001.1.el7sso

red hat advisories RHSA-2024:3568RHSA-2024:3567RHSA-2024:3566

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-2024-4540 updated cvss 7.5

keycloak: exposure of sensitive information in Pushed Authorization Requests (PAR) KC_RESTART cookie

  • Red Hat Middleware Containers for OpenShift rh-sso-7/sso76-openshift-rhel8 7.6-49
    fixed: vendor fix RHSA-2024:3570
  • Red Hat Build of Keycloak
    fixed: vendor fix RHSA-2024:3574
  • Red Hat build of Keycloak 22 rhbk/keycloak-rhel9 22-15, rhbk/keycloak-rhel9-operator 22-18, rhbk/keycloak-operator-bundle 22.0.11-2
    fixed: vendor fix RHSA-2024:3573
  • Red Hat build of Keycloak 24 rhbk/keycloak-rhel9 24-10, rhbk/keycloak-rhel9-operator 24-10, rhbk/keycloak-operator-bundle 24.0.5-2
    fixed: vendor fix RHSA-2024:3576
  • Red Hat Single Sign-On 7
    fixed: vendor fix RHSA-2024:3572
  • Red Hat Single Sign-On 7.6 for RHEL 7 Server rh-sso7-keycloak 18.0.14-1.redhat_00001.1.el7sso, rh-sso7-keycloak-server 18.0.14-1.redhat_00001.1.el7sso
    fixed: vendor fix RHSA-2024:3566
  • Red Hat Single Sign-On 7.6 for RHEL 8 rh-sso7-keycloak 18.0.14-1.redhat_00001.1.el8sso, rh-sso7-keycloak-server 18.0.14-1.redhat_00001.1.el8sso
    fixed: vendor fix RHSA-2024:3567
  • Red Hat Single Sign-On 7.6 for RHEL 9 rh-sso7-keycloak 18.0.14-1.redhat_00001.1.el9sso, rh-sso7-keycloak-server 18.0.14-1.redhat_00001.1.el9sso
    fixed: vendor fix RHSA-2024:3568

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

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.55% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
maven org.keycloak:keycloak-services
<24.0.5
24.0.5

Affected products

  • Red Hat Red Hat Build of Keycloak
  • Red Hat Red Hat build of Keycloak 22
  • Red Hat Red Hat build of Keycloak 24
  • Red Hat Red Hat Single Sign-On 7
  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 7
  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 8
  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 9
  • Red Hat RHEL-8 based Middleware Containers

Classification

Weakness
  • CWE-312 Cleartext Storage of Sensitive Information
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-922 Insecure Storage of Sensitive Information

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.