How broadly exploitable is this vulnerability?

Exploitability depends on how the upgrade interface is exposed. If the router's management interface is reachable from untrusted networks or if authentication is weak or compromised, an attacker may be able to reliably trigger the vulnerable code path remotely.

What level of access does an attacker need to exploit this?

Typically, the attacker must be able to submit requests that reach the `set_upgrade` handler, which may require administrative access to the web UI or an API. In some deployments, misconfigurations or additional flaws could reduce this requirement to network adjacency without valid credentials.

What is the safest general fix pattern?

The safest pattern is to refactor upgrade workflows so that no user-supplied data is ever concatenated into shell commands. Instead, pass strictly validated parameters as structured arguments to non-shell APIs, and centralize validation logic for all upgrade-related fields.

Severity:

CRITICAL RISK

(9.8)

OS Command Injection (CWE-77) in GL-iNet GL-AR300M16 Firmware Upgrade Handler

CVE-2026-26792

Published:

Mar 12, 2026

Status:

Modified

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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May 6, 2026

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-77

Impact:

Remote Code Execution on the Router

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-77

Impact:

Remote Code Execution on the Router

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

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OS Command Injection (CWE-77) in GL-iNet GL-AR300M16 Firmware Upgrade Handler

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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