CVE-2025-14559
📋 TL;DR
This vulnerability in Keycloak's token exchange flow allows disabled users to obtain valid access and refresh tokens, enabling unauthorized access to resources. It affects Keycloak deployments where token exchange is used by privileged clients. Organizations using Keycloak for identity and access management are impacted.
💻 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
Disabled users with previously revoked privileges regain access to sensitive systems and data, potentially leading to data breaches or privilege escalation attacks.
Likely Case
Disabled users can access applications and services they should no longer have permission to use, violating access control policies.
If Mitigated
With proper monitoring and least-privilege client configurations, impact is limited to temporary unauthorized access that can be detected and revoked.
🎯 Exploit Status
Requires a privileged client with token exchange permissions and knowledge of disabled user accounts.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Keycloak 25.0.2 or later
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2025-14559
Restart Required: Yes
Instructions:
1. Backup your Keycloak configuration and database. 2. Download Keycloak 25.0.2 or later from the official website. 3. Stop the Keycloak service. 4. Replace the installation with the patched version. 5. Start the Keycloak service. 6. Verify the fix by testing token exchange with disabled users.
🔧 Temporary Workarounds
Disable Token Exchange
allTemporarily disable token exchange functionality if not required
Update Keycloak realm settings to remove token exchange permissions from clients
Restrict Privileged Clients
allReview and limit which clients have token exchange permissions
Audit client configurations and remove token exchange scope from unnecessary clients
🧯 If You Can't Patch
- Implement additional authentication checks in downstream applications to verify user status
- Increase monitoring of token exchange events and disabled user account activity
🔍 How to Verify
Check if Vulnerable:
Test token exchange flow with a disabled user account using a privileged client - if tokens are issued, the system is vulnerable.Check Version:
Check Keycloak admin console or run: java -jar keycloak-*.jar --versionVerify Fix Applied:
After patching, repeat the vulnerable test - disabled users should receive error responses instead of valid tokens.📡 Detection & Monitoring
Log Indicators:
- Token exchange requests for disabled users
- Unexpected token issuance events
- Authentication events from disabled user accounts
Network Indicators:
- Token exchange API calls to /realms/{realm}/protocol/openid-connect/token with disabled user identifiers
SIEM Query:
source="keycloak" AND (event_type="TOKEN_EXCHANGE" OR message="*token exchange*") AND user_status="disabled"