CVE-2026-40621Network attack vector

Unauthenticated device control via unprotected URLs

Published May 13, 2026 · Updated May 13, 2026

Authentication bypass in four ELECOM wireless routers allows remote attackers to operate affected devices through unauthenticated URLs. Request handlers for specific URLs omit authentication before accepting device operations, but the affected URLs and operations remain undisclosed. Firmware 1.1.1 and earlier is affected on WRC-BE72XSD-B and WRC-BE72XSD-BA, while 1.1.0 and earlier is affected on WRC-BE65QSD-B and WRC-W702-B; network access alone is sufficient.

CVSS severity9.3
Critical
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in four ELECOM wireless routers allows remote attackers to operate affected devices through unauthenticated URLs. Request handlers for specific URLs omit authentication before accepting device operations, but the affected URLs and operations remain undisclosed. Firmware 1.1.1 and earlier is affected on WRC-BE72XSD-B and WRC-BE72XSD-BA, while 1.1.0 and earlier is affected on WRC-BE65QSD-B and WRC-W702-B; network access alone is sufficient.

The record

CVE
CVE-2026-40621
Published
May 13, 2026
Updated
May 13, 2026
Vendor
ELECOM CO., LTD.
Product
WRC-BE65QSD-B
Classifications
CWE-288, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 13, 2026CVE publishedPublication date reported by the CVE source.
  2. May 13, 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=v1.1.0 and earlier

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ELECOM CO., LTD. · WRC-BE65QSD-Bversion=v1.1.0 and earlier
ELECOM CO., LTD. · WRC-BE72XSD-Bversion=v1.1.1 and earlier
ELECOM CO., LTD. · WRC-BE72XSD-BAversion=v1.1.1 and earlier
ELECOM CO., LTD. · WRC-W702-Bversion=v1.1.0 and earlier

Published CVSS scores

9.3JPCERT/CCCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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-288Authentication Bypass Using an Alternate Path or Channel
T1210Exploitation of Remote Services

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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