Auth bypass in Red Hat Build Of Keycloak
CVE-2026-74909
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.008 (58.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-74909 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- access.redhat.com/errata/RHSA-2026:68276 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:68277 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:68278 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:68280 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-74909?
- CVE-2026-74909 is a high-severity vulnerability in Red Hat Build Of Keycloak, classified under Missing Authorization. CVSS score: 8.1/10. Published 2026-09-16.
- How severe is CVE-2026-74909?
- High severity. CVSS v3 base score is 8.1 out of 10.