Cyber Resilience

CVE-2026-22550

HighRCE

Published: 03 February 2026

Published
03 February 2026
Modified
12 May 2026
KEV Added
—
Patch
—
CVSS Score v4 8.6 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0166 73.7th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-22550 is a high-severity OS Command Injection (CWE-78) vulnerability in Elecom Wrc-X1500Gsa-B Firmware. Its CVSS base score is 8.6 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 26.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2026-22550 is an OS command injection vulnerability (CWE-78) affecting Elecom WRC-X1500GS-B and WRC-X1500GSA-B wireless routers. Published on 2026-02-03, it carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). The flaw arises from insufficient input validation, allowing a crafted request to trigger arbitrary OS command execution.

An authenticated user with low privileges (PR:L) can exploit this vulnerability remotely over the network (AV:N) with low attack complexity and no user interaction required. Successful exploitation grants high-impact confidentiality, integrity, and availability effects, enabling full arbitrary OS command execution on the affected device.

Mitigation details are available in advisories from JVN (https://jvn.jp/en/jp/JVN94012927/) and Elecom (https://www.elecom.co.jp/news/security/20260203-01/). Security practitioners should consult these references for patching instructions or workarounds specific to the impacted router firmware.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability details

OS command injection vulnerability exists in ELECOM wireless LAN products. A crafted request from a logged-in user may lead to an arbitrary OS command execution.

CWE(s)
CWE-78

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
attack.mitre.org →
Why these techniques?

OS command injection in public-facing router web interface directly enables remote exploitation (T1190) resulting in arbitrary Unix shell command execution (T1059.004).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2018-25115Shared CWE-78
CVE-2025-24382Shared CWE-78
CVE-2026-29058Shared CWE-78
CVE-2024-57016Shared CWE-78
CVE-2024-46484Shared CWE-78
CVE-2015-10145Shared CWE-78
CVE-2020-37002Shared CWE-78
CVE-2026-27848Shared CWE-78
CVE-2025-0356Shared CWE-78
CVE-2025-13942Shared CWE-78

Affected Assets

elecom
wrc-x1500gsa-b firmware
≤ 1.13
elecom
wrc-x1500gs-b firmware
≤ 1.13

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly requires validation of all inputs to block the crafted requests that trigger OS command injection in this CVE.

SI-2 Flaw Remediation good match
prevent

Mandates timely remediation of the identified flaw (insufficient input validation) via patches or firmware updates referenced in the Elecom/JVN advisories.

AC-6 Least Privilege partial match
prevent

Limits privileges of authenticated users and service accounts so that even successful command injection yields reduced system impact.

References