CVE-2026-21409Network attack vector

Credential and OIDC token disclosure via crafted requests

Published Jan 9, 2026 · Updated Jan 9, 2026

Improper authorization in RICOH Streamline NX 3.5.1 through 24R3 allows man-in-the-middle attackers to retrieve user data and OIDC tokens. Ricoh has not disclosed which request handler fails to authorize crafted requests or how user records and tokens are selected for return. Exploitation requires interception of product-to-user communications and processing of a crafted request; the reported impact is disclosure only.

CVSS severity8.2
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in RICOH Streamline NX 3.5.1 through 24R3 allows man-in-the-middle attackers to retrieve user data and OIDC tokens. Ricoh has not disclosed which request handler fails to authorize crafted requests or how user records and tokens are selected for return. Exploitation requires interception of product-to-user communications and processing of a crafted request; the reported impact is disclosure only.

The record

CVE
CVE-2026-21409
Published
Jan 9, 2026
Updated
Jan 9, 2026
Vendor
Ricoh Company, Ltd.
Product
RICOH Streamline NX
Classifications
CWE-639, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.5.1 to 24R3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ricoh Company, Ltd. · RICOH Streamline NXversion=3.5.1 to 24R3

Published CVSS scores

8.2JPCERT/CCCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
5.9JPCERT/CCCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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