High severity · published Sep 28, 2026
CVE-2026-86530
BUFFALO Wi-Fi products handle some web form input improperly to assemble command line strings internally
7.2
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WE
WEX-G300 · BUFFALO INC.
before Ver.1.71 · source: vendor
WS
WSR-300HP · BUFFALO INC.
before Ver.2.55 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86530
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-86530
www.buffalo.jp
https://www.buffalo.jp/news/detail/20260928-01.html
jvn.jp
https://jvn.jp/en/vu/JVNVU94863997/
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7.5
CVE-2026-95104
Stack-based buffer overflow vulnerability exists in BUFFALO Wi-Fi products