CVE-2024-4540
Keycloak: exposure of sensitive information in pushed authorization requests (par) kc_restart cookie
CVSS Score
7.5
EPSS Score
0.3%
EPSS Percentile
51th
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.
| CWE | CWE-312 |
| Published | Jun 3, 2024 |
| Last Updated | Mar 26, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
Red Hat / Red Hat Build of Keycloak
All versions affected Red Hat / Red Hat Build of Keycloak
All versions affected Red Hat / Red Hat build of Keycloak 22
All versions affected Red Hat / Red Hat build of Keycloak 22
All versions affected Red Hat / Red Hat build of Keycloak 22
All versions affected Red Hat / Red Hat build of Keycloak 24
All versions affected Red Hat / Red Hat build of Keycloak 24
All versions affected Red Hat / Red Hat build of Keycloak 24
All versions affected Red Hat / Red Hat Single Sign-On 7
All versions affected Red Hat / Red Hat Single Sign-On 7.6 for RHEL 7
All versions affected Red Hat / Red Hat Single Sign-On 7.6 for RHEL 8
All versions affected Red Hat / Red Hat Single Sign-On 7.6 for RHEL 9
All versions affected Red Hat / RHEL-8 based Middleware Containers
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2024:3566 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:3567 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:3568 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:3570 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:3572 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:3573 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:3574 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:3575 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:3576 access.redhat.com: https://access.redhat.com/security/cve/CVE-2024-4540 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2279303
Credits
Red Hat would like to thank Manuel Schallar for reporting this issue.