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Vulnerabilities

Vulnerability · CVE-2026-21409

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

Published Jan 9, 2026 · catalog updated Jan 9, 2026 · RICOH COMPANY, LTD. RICOH Streamline NX

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-21409. EPSS is 0.33%. Act only if a listed version of RICOH COMPANY, LTD. RICOH Streamline NX is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High8.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.33%
Remediation
Advisory link
Affected products
vendor RICOH COMPANY, LTD. RICOH Streamline NX 3.5.1 to 24R3

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor RICOH COMPANY, LTD. RICOH Streamline NX 3.5.1 to 24R33.5.1 to 24R3

How to fix CVE-2026-21409

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-21409. EPSS is 0.33%. Act only if a listed version of RICOH COMPANY, LTD. RICOH Streamline NX is installed.

Which versions are affected?

Compare what you have installed with RICOH COMPANY, LTD. RICOH Streamline NX 3.5.1 to 24R3 3.5.1 to 24R3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.33%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 9, 2026 · EUVD

    Detected

    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.

  2. Jan 9, 2026 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-21409

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-21409

    30-day exploitation probability 0.33%

    first.org
  • EUVDVulnerability recordEUVD-2026-1780

    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 a

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 6, 2026
  • CVE.orgOct 31, 2026
  • EUVDOct 30, 2026