CVE-2026-4636 is a high-severity security vulnerability in org.keycloak:keycloak-services (maven), affecting versions < 26.5.7. It is fixed in 26.5.7.
A flaw was found in Keycloak. An authenticated user with the uma_protection role can bypass User-Managed Access (UMA) policy validation. This allows the attacker to include resource identifiers owned by other users in a policy creation request, even if the URL path specifies an attacker-owned resource. Consequently, the attacker gains unauthorized permissions to victim-owned resources, enabling them to obtain a Requesting Party Token (RPT) and access sensitive information or perform unauthorized actions.
CVE-2026-4636 has a CVSS score of 8.1 (High). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment.
A fixed version is available (26.5.7). Upgrading removes the vulnerable code path.
maven
org.keycloak:keycloak-services (< 26.5.7)org.keycloak:keycloak-services → 26.5.7 (maven)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter instead of chasing every advisory.
Kodem's runtime-powered SCA identifies whether CVE-2026-4636 is reachable in your applications. Explore open-source security for your team.
See if CVE-2026-4636 is reachable in your applications. Get a demo
Already deployed Kodem? See CVE-2026-4636 in your environment →Upgrade org.keycloak:keycloak-services to 26.5.7 or later to resolve this vulnerability.
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
CVE-2026-4636 is a high-severity security vulnerability in org.keycloak:keycloak-services (maven), affecting versions < 26.5.7. It is fixed in 26.5.7.
CVE-2026-4636 has a CVSS score of 8.1 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
org.keycloak:keycloak-services (maven) versions < 26.5.7 is affected.
Yes. CVE-2026-4636 is fixed in 26.5.7. Upgrade to this version or later.
Whether CVE-2026-4636 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
Upgrade org.keycloak:keycloak-services to 26.5.7 or later.