What’s Vulnerable › Vulnerabilities

CVE-2026-18572: Keycloak-services: keycloak-services: uma claim token can override authorization time-policy evaluation attributes

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-02 · updated 2026-09-16
• Weakness: CWE-863

Description

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.

Affected products

• Red Hat build of Keycloak 26.4: all versions

References

• https://access.redhat.com/errata/RHSA-2026:68277
• https://access.redhat.com/errata/RHSA-2026:68278
• https://access.redhat.com/security/cve/CVE-2026-18572
• https://bugzilla.redhat.com/show_bug.cgi?id=2509763

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