CVE-2026-21409
📋 TL;DR
An improper authorization vulnerability in RICOH Streamline NX allows man-in-the-middle attackers to retrieve user registration information and OIDC tokens. This affects users of RICOH Streamline NX versions 3.5.1 through 24R3. The vulnerability requires an attacker to intercept communications between the product and its users.
💻 Affected Systems
- RICOH Streamline NX
⚠️ 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
Attackers could steal sensitive user registration data and OIDC tokens, potentially enabling identity theft, unauthorized access to connected systems, and privilege escalation.
Likely Case
Attackers on the same network segment could intercept communications and harvest user credentials and tokens for lateral movement or credential reuse attacks.
If Mitigated
With proper network segmentation and TLS enforcement, the attack surface is significantly reduced, though the underlying vulnerability remains.
🎯 Exploit Status
Exploitation requires network access to intercept communications and ability to craft specific requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 24R4 or later
Vendor Advisory: https://www.ricoh.com/products/security/vulnerabilities/vul?id=ricoh-2025-000011
Restart Required: Yes
Instructions:
1. Download RICOH Streamline NX version 24R4 or later from official RICOH sources. 2. Backup current configuration and data. 3. Install the updated version following RICOH's installation guide. 4. Restart the application/service. 5. Verify successful update and functionality.
🔧 Temporary Workarounds
Enforce TLS Encryption
allRequire TLS 1.2 or higher for all communications between RICOH Streamline NX and clients
Network Segmentation
allIsolate RICOH Streamline NX systems to trusted network segments only
🧯 If You Can't Patch
- Implement strict network access controls to limit who can communicate with RICOH Streamline NX
- Deploy network monitoring and IDS/IPS to detect man-in-the-middle attempts
🔍 How to Verify
Check if Vulnerable:
Check RICOH Streamline NX version in administration interface or configuration files. If version is between 3.5.1 and 24R3 inclusive, system is vulnerable.Check Version:
Check product documentation for version query method (typically via web interface or configuration files)Verify Fix Applied:
Verify version is 24R4 or later in administration interface. Test that TLS encryption is enforced for all client communications.📡 Detection & Monitoring
Log Indicators:
- Unusual authentication patterns
- Multiple failed authorization attempts from same source
- Unexpected OIDC token requests
Network Indicators:
- Unencrypted traffic to/from RICOH Streamline NX ports
- ARP spoofing or other MITM indicators on network segments containing the system
SIEM Query:
source="ricoh-streamline" AND (event_type="auth_failure" OR protocol="http" NOT protocol="https")