CVE-2026-86530

State: Published
Severity: 8.6 High
Published: Sep 28, 2026
Updated: Sep 30, 2026
Reserved: Sep 24, 2026

Description

BUFFALO Wi-Fi products handle some web form input improperly to assemble command line strings internally. An administrative user may send a crafted HTTP request and execute an arbitrary OS command.

Scores

CVSS	Score	Vector	Source
4.0	8.6 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	jpcert
3.1	7.2 High	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H	jpcert

Weaknesses

CWE-78 Improper neutralization of special elements used in an OS command ('OS Command Injection')

Affected Products

Product	Versions
WSR-300HPBUFFALO INC.	before Ver.2.55Affected
WEX-G300BUFFALO INC.	before Ver.1.71Affected

References

https://www.buffalo.jp/news/detail/20260928-01.html
https://jvn.jp/en/vu/JVNVU94863997/

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