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CVE-2026-21409

5.9 · MEDIUM

Improper authorization vulnerability exists in RICOH Streamline NX 3.5.1 to 24R3.

Published Jan 9, 2026CWE-639EPSS 0.33%

Overview

CVE-2026-21409 is a medium-severity vulnerability. It was published on January 9, 2026 and has a CVSS 3.0 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Improper authorization vulnerability exists in RICOH Streamline NX 3.5.1 to 24R3. If a man-in-the-middle attack is conducted on the communication between the affected product and its user, and some crafted request is processed by the product, the user's registration information and/or OIDC (OpenID Connect) tokens may be retrieved.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refjvn.jp/en/jp/JVN12770174/Refwww.ricoh.com/products/security/vulnerabilities/vul?id=ricoh-2025-000011

How CyberStrike helps

Frequently asked questions

What is CVE-2026-21409?

CVE-2026-21409 is a medium-severity vulnerability. It was published on January 9, 2026 and has a CVSS 3.0 base score of 5.9 (MEDIUM).

How severe is CVE-2026-21409?

This vulnerability has a CVSS 3.0 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-21409?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-21409?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-21409 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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