GHSA-27gp-8389-hm4w
MEDIUMGHSA-27gp-8389-hm4w is a medium-severity (CVSS 6.5) Improper Privilege Management vulnerability in org.keycloak:keycloak-services. O3 Security confirms whether GHSA-27gp-8389-hm4w is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Keycloak Privilege Escalation Vulnerability in Admin Console (FGAPv2 Enabled)
Blast Radius
org.keycloak:keycloak-servicesReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
A Privilege Escalation vulnerability was identified in the Keycloak identity and access management solution, specifically when FGAPv2 is enabled in version 26.2.x. The flaw lies in the admin permission enforcement logic, where a user with manage-users privileges can self-assign realm-admin rights. The escalation occurs due to missing privilege boundary checks in role mapping operations via the admin REST interface. A malicious administrator with limited permissions can exploit this by editing their own user roles, gaining unauthorized full access to realm configuration and user data.
This issue has been fixed in versions 26.2.6, and 26.3.0.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.keycloak:keycloak-services | ≥ 26.2.0&&< 26.2.6 | 26.2.6 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.keycloak:keycloak-services. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update org.keycloak:keycloak-services to 26.2.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-27gp-8389-hm4w is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-27gp-8389-hm4w is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-27gp-8389-hm4w. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-27gp-8389-hm4w in your dependencies?
O3 detects GHSA-27gp-8389-hm4w across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.