CVE-2025-12789
📋 TL;DR
An open redirect vulnerability in Red Hat Single Sign-On allows attackers to redirect users to malicious websites during logout. This occurs when the redirect_uri parameter in the openid-connect logout protocol fails to properly validate URLs. Organizations using vulnerable versions of Red Hat SSO are affected.
💻 Affected Systems
- Red Hat Single Sign-On
⚠️ 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
Users could be redirected to phishing sites that steal credentials or deliver malware, potentially leading to account compromise and lateral movement.
Likely Case
Attackers trick users into visiting malicious sites that appear legitimate, potentially harvesting session tokens or credentials.
If Mitigated
With proper URL validation and user awareness, impact is limited to failed phishing attempts with minimal security impact.
🎯 Exploit Status
Open redirect vulnerabilities typically require user interaction (clicking a link) but are straightforward to exploit once discovered
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Red Hat advisory for specific patched versions
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2025-12789
Restart Required: Yes
Instructions:
1. Check Red Hat advisory for affected versions
2. Apply the latest security updates for Red Hat SSO
3. Restart the SSO service
4. Verify the fix by testing logout redirect functionality
🔧 Temporary Workarounds
Implement URL validation at proxy level
allConfigure web application firewall or reverse proxy to validate redirect URLs
Restrict allowed redirect domains
allConfigure SSO to only allow redirects to approved domains
🧯 If You Can't Patch
- Implement network segmentation to isolate SSO servers
- Deploy web application firewall with open redirect protection rules
🔍 How to Verify
Check if Vulnerable:
Test logout functionality with malicious redirect_uri parameter to see if redirect occursCheck Version:
Check Red Hat SSO version via management console or application logsVerify Fix Applied:
After patching, retest with malicious redirect_uri to confirm proper validation blocks the redirect📡 Detection & Monitoring
Log Indicators:
- Unusual redirect URLs in logout requests
- Multiple failed logout attempts with suspicious parameters
Network Indicators:
- HTTP 302 redirects to unexpected domains during logout
- Unusual outbound connections following SSO logout
SIEM Query:
source="sso-logs" AND (event="logout" AND redirect_uri CONTAINS "malicious-domain")