Auth bypass in Red Hat Build Of Keycloak
CVE-2026-18572
Keycloak provides authorization services that allow administrators to restrict access to resources based on time policies (for example, only allowing access during business hours). A flaw was discovered where a user can include a fake time value in their authorization request that overrides the actual server time. This allows the user to bypass these time-based restrictions and access protected resources at unauthorized times.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (33.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-18572 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:68277 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:68278 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-18572?
- CVE-2026-18572 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Incorrect Authorization. CVSS score: 6.5/10. Published 2026-08-02.
- How severe is CVE-2026-18572?
- Medium severity. CVSS v3 base score is 6.5 out of 10.