Is CVE-2026-40621 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-40621 being exploited in the wild.

How severe is CVE-2026-40621?

Critical severity, with a CVSS score of 9.8, published 13 May 2026.

Which products and versions are affected?

Elecom WRC-BE65QSD-B v1.1.0 and earlier; Elecom WRC-BE72XSD-B v1.1.1 and earlier; Elecom WRC-BE72XSD-BA v1.1.1 and earlier; Elecom WRC-W702-B v1.1.0 and earlier.

Is there a fix for CVE-2026-40621?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-40621 attacked?

It is attacked over the network.

Am I affected by CVE-2026-40621?

Check whether you run Elecom WRC-BE65QSD-B, Elecom WRC-BE72XSD-B, Elecom WRC-BE72XSD-BA or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-40621: ELECOM Wireless LAN devices authentication bypass in web interface

CVE-2026-40621 · Severity: critical · CVSS 9.8 · Published 2026-05-13

ELECOM wireless routers and access points are affected by a security flaw that allows unauthorized individuals to access administrative functions without a password. By visiting specific web addresses on the device, an attacker can take full control of the hardware, potentially monitoring network traffic or changing security settings. This could lead to a complete compromise of the local network's privacy and security.

Technologies: Elecom WRC-BE65QSD-B, Elecom WRC-BE72XSD-B, Elecom WRC-BE72XSD-BA, Elecom WRC-W702-B. Vendors: Elecom.

Quick answers

Is CVE-2026-40621 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-40621 being exploited in the wild.
How severe is CVE-2026-40621?: Critical severity, with a CVSS score of 9.8, published 13 May 2026.
Which products and versions are affected?: Elecom WRC-BE65QSD-B v1.1.0 and earlier; Elecom WRC-BE72XSD-B v1.1.1 and earlier; Elecom WRC-BE72XSD-BA v1.1.1 and earlier; Elecom WRC-W702-B v1.1.0 and earlier.
Is there a fix for CVE-2026-40621?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-40621 attacked?: It is attacked over the network.
Am I affected by CVE-2026-40621?: Check whether you run Elecom WRC-BE65QSD-B, Elecom WRC-BE72XSD-B, Elecom WRC-BE72XSD-BA or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A vulnerability classified as CWE-288 (Authentication Bypass Using an Alternate Path or Channel) exists in several ELECOM wireless LAN products. The web management interface fails to enforce authentication checks on specific URLs, allowing a remote attacker to bypass the login screen and access administrative functions. This flaw can be exploited over the network without any user interaction or prior credentials. Successful exploitation allows the attacker to modify device configurations, potentially leading to full device takeover. Users are advised to update to the latest firmware versions provided by the manufacturer.

Affected products

ELECOM WRC-BE72XSD-B v1.1.1 and earlier
ELECOM WRC-BE72XSD-BA v1.1.1 and earlier
ELECOM WRC-BE65QSD-B v1.1.0 and earlier
ELECOM WRC-W702-B v1.1.0 and earlier

Timeline

2026-05-12: advisory: Initial advisory published by JVN/JPCERT and ELECOM
2026-05-13: disclosed: CVE published to NVD

References

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