CVE-2026-18572 Keycloak-services: keycloak-services: uma claim token can override authorization time-policy evaluation attributes
Attackers can bypass time-based access restrictions in Keycloak by injecting fake time values into authorization requests, gaining unauthorized access to protected resources.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-18572?
CVE-2026-18572 is a medium-severity vulnerability in Redhat Build of Keycloak, published on 2 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-18572?
1 open source package ship an affected version, including keycloak. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
keycloak Bitnami | All versions | 26.7.3 |
Products include Redhat Build of Keycloak.
How do I fix CVE-2026-18572?
Upgrade keycloak to 26.7.3 or later.
Is CVE-2026-18572 being exploited?
There is no known exploitation of CVE-2026-18572 in the wild and no public exploit code.
Other vulnerabilities in Redhat Build of Keycloak
- CVE-2026-15572 Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation
- CVE-2026-3047 Keycloak SAML Broken has Authentication Bypass by Primary Weakness
- CVE-2026-15573 Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher
- CVE-2026-16102 Keycloak-services: keycloak-services: default dcr policy allows role forgery via user property mappers
- CVE-2026-1609 Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users
Sources
Also known as BIT-keycloak-2026-18572, CLEANSTART-2026-IG03697, GHSA-mcjq-c4g7-wcfh.