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.

Attack Vector Network

Attack Complexity Low

Privileges Required High

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0036.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
BUFFALO INC. WSR-300HP unaffected
Version Status Constraints
0 affected < Ver.2.55
BUFFALO INC. WEX-G300 unaffected
Version Status Constraints
0 affected < Ver.1.71

No data.

No data.

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Vendors Products
Buffalo Subscribe
Wex-g300 Subscribe
Wsr-300hp Subscribe

Project Subscriptions

Vendors Products
Buffalo Subscribe
Wex-g300 Subscribe
Wsr-300hp Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://jvn.jp/en/vu/JVNVU94863997/ cve-icon cve-icon
https://www.buffalo.jp/news/detail/20260928-01.html cve-icon cve-icon
History

Mon, 28 Sep 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Buffalo
Buffalo wex-g300
Buffalo wsr-300hp
Vendors & Products Buffalo
Buffalo wex-g300
Buffalo wsr-300hp

Mon, 28 Sep 2026 09:45:00 +0000

Type Values Removed Values Added
Title Administrative Privilege Exploit Enables OS Command Execution via Web Form Input

Mon, 28 Sep 2026 08:45:00 +0000

Type Values Removed Values Added
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.
Weaknesses CWE-78
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.6, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: jpcert

Published:

Updated: 2026-09-28T08:14:00.049Z

Reserved: 2026-09-24T08:54:17.872Z

Link: CVE-2026-86530

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-28T09:17:07.653

Modified: 2026-09-28T09:17:07.653

Link: CVE-2026-86530

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-28T16:23:11Z

Weaknesses