CVE-2026-74909
Keycloak-services: keycloak-services: incomplete fix for cve-2026-15573 allows policy enforcer bypass via percent-encoded uri segments
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
Keycloak provides a policy enforcer to protect applications by matching incoming web requests against defined security policies. A flaw was found where the enforcer fails to correctly normalize web addresses that contain special encoded characters, such as those representing semicolons or directory traversal segments. An authenticated user can use these encoded characters to trick the enforcer into applying a less restrictive security policy than intended, potentially gaining unauthorized access to sensitive administrative or private application endpoints.
| CWE | CWE-862 |
| Vendor | red hat |
| Product | red hat build of keycloak 26.4 |
| Published | Sep 16, 2026 |
| Last Updated | Sep 16, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4.16
All versions affected Red Hat / Red Hat build of Keycloak 26.4.16
All versions affected Red Hat / Red Hat build of Keycloak 26.6
All versions affected Red Hat / Red Hat build of Keycloak 26.6
All versions affected Red Hat / Red Hat build of Keycloak 26.6
All versions affected Red Hat / Red Hat build of Keycloak 26.6.7
All versions affected Red Hat / Red Hat build of Keycloak 26.6.7
All versions affected Red Hat / Red Hat Single Sign-On 7
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:68276 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:68277 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:68278 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:68280 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-74909 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2517354
Credits
Red Hat would like to thank Stefan Guilhen (IBM) for reporting this issue.