What is the CVSS score of CVE-2026-21409?

CVE-2026-21409 has a CVSS 3.0 base score of 5.9 (Medium). CVSS vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of RICOH Streamline NX are affected by CVE-2026-21409?

CVE-2026-21409 presents moderate security risk, a IDOR vulnerability rated CVSS 5.9. Exploitation could compromise the security of affected deployments.

How to fix or mitigate CVE-2026-21409?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

RICOH Streamline NX CVE-2026-21409

MEDIUM

Authorization Bypass Through User-Controlled Key (CWE-639)

2026-01-09 vultures@jpcert.or.jp

Authentication Bypass

5.9

CVSS 3.0 · NVD

Severity by source

NVD PRIMARY

5.9 MEDIUM

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Jan 09, 2026 - 08:15 nvd

MEDIUM 5.9

DescriptionCVE.org

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.

AnalysisAI

Improper authorization vulnerability exists in RICOH Streamline NX 3.5.1 to 24R3. [CVSS 5.9 MEDIUM]

Technical ContextAI

Classified as CWE-639 (Authorization Bypass Through User-Controlled Key). 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.