What is the CVSS score of CVE-2026-26792?

CVE-2026-26792 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-2026-26792?

Within 24 hours: Identify all GL-AR300M16 v4.3.11 devices in your network inventory and isolate them from critical systems; disable remote management access and restrict administrative interfaces to specific trusted IP ranges only. Within 7 days: Evaluate replacement hardware or alternative routing solutions; contact GL-iNet for interim security guidance and patch timeline; implement enhanced monitoring for suspicious upgrade attempts on affected devices. Within 30 days: Complete migration away from vulnerable devices to patched alternatives; conduct forensic analysis of access logs to detect potential exploitation.

Ar300m16 Firmware CVE-2026-26792

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 HTTP request to set_upgrade function
Exploit

Inject OS commands in modem_url parameter
Execution

Execute arbitrary commands as root
Impact

Achieve 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_upgrade function accessible. No authentication required. Remote unauthenticated exploitation against default configurations via network.
Impact	CVSS 9.8 (Critical). Network vector, no auth, low complexity. The large number of injectable parameters makes WAF bypass easier – if one parameter is filtered, six others remain exploitable. EPSS 0.17%.
Exploit ScenarioDerived	An attacker targets the firmware upgrade endpoint, injecting commands through the hash_value parameter to download and execute a persistent backdoor on the router.

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 multiple command injection vulnerabilities in the set_upgrade function through seven different parameters. Each parameter provides an independent code execution vector on the router.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 19:57 CVSS 9.8

GL-iNet GL-AR300M16 v4.3.11 has seven command injection vectors in set_upgrade via modem_url, target_version, current_version, firmware_upload, hash_type, hash_value, and upgrade_type parameters.

RemediationAI

Update to a patched firmware version. Block access to the management interface from WAN. Consider replacing the device if no patch is forthcoming.

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_upgrade function concatenates multiple user-controlled parameters into system commands without sanitization (CWE-77). Seven separate parameters are vulnerable: modem_url, target_version, current_version, firmware_upload, hash_type, hash_value, and upgrade_type.

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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 multiple command injection vulnerabilities in the set_upgrade function via the modem_url, target_version, current_version, firmware_upload, hash_type, hash_value, and upgrade_type parameters. These vulnerabilities allow attackers to execute arbitrary commands via a crafted input.

Executive ViewAI

Why It Matters

GL-iNet GL-AR300M16 routers running v4.3.11 contain critical command injection vulnerabilities that allow unauthenticated attackers to execute arbitrary commands with no patch currently available. Organizations using this device model face immediate risk of network compromise, data exfiltration, and lateral movement into corporate systems, particularly concerning for distributed offices or remote locations relying on these routers.

Business Impact: Severe

Compensating Controls

Disable the upgrade function entirely if not actively required; implement network segmentation to restrict affected router access to non-critical segments only; deploy WAF rules blocking POST requests to upgrade endpoints; restrict administrative access via whitelist of trusted IPs only; enable comprehensive logging and alerting on all upgrade-related activities; consider temporary replacement with alternative routing hardware until patch availability; monitor GL-iNet security advisories closely for patch release timeline.

Threat Intelligence Overview

EPSS Score

0.2%

Top 62% 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.