Vulnerability · Published Sep 28, 2026 · Assigned by jpcert
CVE-2026-86530
High 7.2
In plain English
A high-severity OS command injection in WEX-G300 from BUFFALO INC.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).
Severity (CVSS 3.1)7.2High
Exploit odds (30 days)0.4%top 70.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| BUFFALO INC. | WSR-300HP | 0 – before Ver.2.55 |
| BUFFALO INC. | WEX-G300 | 0 – before Ver.1.71 |
Weakness: CWE-78 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H