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HIGH severity

CVE-2026-9800

HIGH

CVE-2026-9800 is a high-severity (CVSS 8.1) CWE-1025 vulnerability in redhat build of keycloak. O3 Security detects and blocks CVE-2026-9800 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.

A flaw was found in Keycloak Policy Enforcer. This vulnerability allows any authenticated user to bypass all authorization policies, including role, scope, and User-Managed Access (UMA)…

Published
Jun 25, 2026
Updated
Aug 6, 2026
Affected
1 product
Patched
See advisory
Exploits
None indexed
Exploitation data as of Aug 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Description

A flaw was found in Keycloak Policy Enforcer. This vulnerability allows any authenticated user to bypass all authorization policies, including role, scope, and User-Managed Access (UMA) permission checks. By including the configured access-denied page path within a request URL, either as a path segment or a query parameter, an attacker can gain unauthorized access to protected resources.

Affected Products

1 product · 2 configurations
Application
build of keycloakredhat
≥ 26.6 && ≤ 26.6.4
range

Detection & mitigation playbook

Vendor / appliance
  1. Detect

    Inventory every redhat build of keycloak deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for exploitation at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.

  2. Fix

    Apply the redhat build of keycloak security patch or hotfix for CVE-2026-9800 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.

  4. How O3 protects you

    O3 detects and blocks CVE-2026-9800 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Tailored to CVE-2026-9800. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

A flaw was found in Keycloak Policy Enforcer. This vulnerability allows any authenticated user to bypass all authorization policies, including role, scope, and User-Managed Access (UMA) permission checks. By including the configured access-denied page path within a request URL, either as a path segment or a query parameter, an attacker can gain unauthorized access to protected resources.
O3 Security · Runtime Protection

Is CVE-2026-9800 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2026-9800 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.

CVE-2026-9800: Build Of Keycloak CWE-1025… | O3 Security