What is CVE-2026-86530?

CVE-2026-86530 is a high-severity vulnerability in Buffalo Inc. Wex-G300, classified under OS Command Injection. CVSS score: 7.2/10. Published 2026-09-28.

How severe is CVE-2026-86530?

High severity. CVSS v3 base score is 7.2 out of 10.

RCE in Buffalo Inc. Wex-G300

CVE-2026-86530

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.

Vulnerability class: Command Injection (OS Command Injection)

Published 2026-09-28.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (27.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

Frequently asked questions

What is CVE-2026-86530?: CVE-2026-86530 is a high-severity vulnerability in Buffalo Inc. Wex-G300, classified under OS Command Injection. CVSS score: 7.2/10. Published 2026-09-28.
How severe is CVE-2026-86530?: High severity. CVSS v3 base score is 7.2 out of 10.