CVE-2026-1486
📋 TL;DR
This vulnerability allows attackers to bypass disabled Identity Provider (IdP) checks in Keycloak's JWT authorization grant flow. An attacker with a disabled IdP's signing key can generate valid JWT assertions that Keycloak accepts, leading to unauthorized access token issuance. This affects Keycloak deployments where IdPs have been disabled for security reasons.
💻 Affected Systems
- Keycloak
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover and privilege escalation across all applications relying on Keycloak authentication, potentially leading to data breaches and system compromise.
Likely Case
Unauthorized access to applications and services protected by Keycloak, allowing attackers to impersonate legitimate users.
If Mitigated
Limited impact if proper key rotation and monitoring are in place, but still represents an authentication bypass risk.
🎯 Exploit Status
Requires possession of a disabled IdP's signing key, which an attacker might obtain through previous compromise or insider access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Red Hat advisory for specific fixed versions
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2026-1486
Restart Required: Yes
Instructions:
1. Check Red Hat advisory for fixed Keycloak version. 2. Update Keycloak to patched version. 3. Restart Keycloak service. 4. Verify fix is applied.
🔧 Temporary Workarounds
Disable JWT authorization grant flow
allTemporarily disable the vulnerable JWT authorization grant flow if not required
Modify Keycloak realm configuration to disable JWT authorization grant flow
Rotate IdP signing keys
allRotate signing keys for all disabled Identity Providers
Generate new signing keys for disabled IdPs and update configurations
🧯 If You Can't Patch
- Monitor for unauthorized token issuance from disabled IdPs
- Implement additional authentication checks at application layer
🔍 How to Verify
Check if Vulnerable:
Check if using JWT authorization grant flow with disabled Identity Providers in Keycloak configurationCheck Version:
keycloak/bin/kc.sh --version or check Keycloak admin consoleVerify Fix Applied:
Test that disabled IdPs no longer accept JWT assertions after patch📡 Detection & Monitoring
Log Indicators:
- JWT token issuance from disabled Identity Providers
- Authentication attempts using disabled IdP identifiers
Network Indicators:
- Unusual token requests to JWT authorization endpoint
SIEM Query:
source="keycloak" AND ("disabled" AND "identity provider" AND "jwt")