What is the CVSS score of CVE-2026-26793?

CVE-2026-26793 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.2%.

How to fix or mitigate CVE-2026-26793?

Within 24 hours: Identify and inventory all GL-AR300M16 v4.3.11 devices across the organization; isolate affected devices from critical network segments if operationally feasible. Within 7 days: Implement network-level controls (WAF rules, IP whitelisting, segmentation) to restrict access to the set_config function; disable remote administration features if not essential; monitor for suspicious command patterns. Within 30 days: Coordinate with GL-iNet for patched firmware release; plan upgrade/replacement strategy; conduct forensic analysis of affected devices for indicators of compromise.

Ar300m16 Firmware CVE-2026-26793

CRITICAL

Command Injection (CWE-77)

2026-03-12 cve@mitre.org

Command Injection Ar300m16 Firmware Gl Inet

9.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Send crafted input to set_config function
Exploit

Inject shell metacharacters into parameter
Execution

Execute arbitrary commands as device root
Impact

Gain full system compromise

Vulnerability Assessment

Weakness	CWE CWE-77 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization Command injection prevention MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	GL-iNet GL-AR300M16 running firmware v4.3.11 with set_config function accessible via network interface. No authentication required; remote unauthenticated exploitation against default device configurations.
Impact	CVSS 9.8 (Critical). Four separate command injection CVEs in one router model indicate pervasive insecure coding practices. EPSS 0.23%.
Exploit ScenarioDerived	An attacker exploits the set_config endpoint to inject commands, gaining root access to the router. The availability of four different injection points means that even partial patching may leave the device exploitable.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

GL-iNet GL-AR300M16 v4.3.11 has a command injection in the set_config function, adding to the growing list of injection vulnerabilities in this device. This is the fourth distinct command injection CVE for this router model.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 19:57 CVSS 9.8

GL-iNet GL-AR300M16 v4.3.11 allows command injection through the set_config function – the fourth injection vulnerability in this device.

RemediationAI

Firmware update required. Given the number of vulnerabilities, strongly consider replacing this device with a model from a vendor with better security practices.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The set_config function fails to sanitize input before passing it to system commands (CWE-77). This CVE joins CVE-2026-26791, CVE-2026-26792, and CVE-2025-70245 as part of a systemic command injection problem across the GL-AR300M16 web interface.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

GL-iNet GL-AR300M16 v4.3.11 was discovered to contain a command injection vulnerability via the set_config function. This vulnerability allows attackers to execute arbitrary commands via a crafted input.

Executive ViewAI

Why It Matters

A critical remote code execution vulnerability (CVE-2026-26793) affects GL-iNet GL-AR300M16 routers running v4.3.11, allowing unauthenticated attackers to execute arbitrary commands on affected devices. Organizations deploying this router model face immediate risk of network compromise, data exfiltration, and lateral movement into connected systems. No vendor patch is currently available, requiring immediate alternative mitigation strategies.

Business Impact: Severe

Compensating Controls

Implement network segmentation to isolate affected routers from critical assets; deploy WAF or IDS/IPS rules to block malicious set_config requests; disable remote web administration and restrict management access to trusted IPs only; monitor command execution logs for injection attempts; consider replacement with patched firmware version or alternative vendor equipment if GL-iNet patch timeline extends beyond 30 days.

Threat Intelligence Overview

EPSS Score

0.2%

Top 55% exploitable

Data Quality

5 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC No

EPSS 0.2%

Patch available No

Active threat No

Deciding rule

CRITICAL severity

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.