Cyber Resilience

CVE-2026-26795

RCE in Gl-Inet Ar300M16 Firmware 4.3.11

Public PoCRCECommand Injection
Published
12 March 2026
Modified
16 March 2026
CVSS Score v3.1 9.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.025 83th percentile
Risk Priority 75 floored blend · peak EPSS

Summary

CVE-2026-26795 is a critical-severity Command Injection (CWE-77) vulnerability in Gl-Inet Ar300M16 Firmware. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Command and Scripting Interpreter (T1059); ranked in the top 17% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SI-10 (Information Input Validation) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2026-26795 is a command injection vulnerability affecting the GL-iNet GL-AR300M16 router running firmware version 4.3.11. The flaw exists in the M.get_system_log function, where the module parameter fails to properly sanitize user input, enabling attackers to inject and execute arbitrary operating system commands. This issue, classified under CWE-77 (Command Injection), carries a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating critical severity due to its potential for high-impact remote exploitation.

The vulnerability can be exploited by unauthenticated attackers over the network with low complexity and no user interaction required. By crafting malicious input for the module parameter, an attacker can execute arbitrary commands on the device, potentially leading to full system compromise, including data theft, modification of configurations, or further lateral movement within a network. The unchanged scope and high impacts on confidentiality, integrity, and availability underscore its risk to Internet-exposed IoT devices.

A proof-of-concept demonstrating the vulnerability is available in the GitHub repository at https://github.com/sezangel/IOT-vul/tree/main/GL-iNet/GL-AR300M16/logread--get_system_log. No vendor advisories or patches were referenced in the CVE details.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability Data

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

CWE(s)
CWE-77

Related Threats

MITRE ATT&CK Enterprise Techniques

T1059 Command and Scripting Interpreter Execution
Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.
attack.mitre.org →
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 →
T1059.001 PowerShell Execution
Adversaries may abuse PowerShell commands and scripts for execution.
attack.mitre.org →
T1059.003 Windows Command Shell Execution
Adversaries may abuse the Windows command shell for execution.
attack.mitre.org →
T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
attack.mitre.org →
T1059.008 Network Device CLI Execution
Adversaries may abuse scripting or built-in command line interpreters (CLI) on network devices to execute malicious command and payloads.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-26791Same product: Gl-Inet Ar300M16
CVE-2026-26793Same product: Gl-Inet Ar300M16
CVE-2026-26792Same product: Gl-Inet Ar300M16
CVE-2026-26794Same product: Gl-Inet Ar300M16
CVE-2023-31473Same vendor: Gl-Inet
CVE-2023-31476Same vendor: Gl-Inet
CVE-2025-67089Same vendor: Gl-Inet
CVE-2024-39226Same product: Gl-Inet Ar300M16
CVE-2023-50445Same vendor: Gl-Inet
CVE-2024-39228Same product: Gl-Inet Ar300M16

Affected Assets

gl-inet
ar300m16 firmware
4.3.11

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V1.2.3
  • V1.2.5
  • V1.2.8
  • V1.2.9

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and evaluation can discover command-construction flaws before deployment.

SI-10 Information Input Validation good match

Input validation directly stops construction of commands from untrusted data containing special elements.

SA-8 Security and Privacy Engineering Principles partial match

Secure engineering principles include proper neutralization and safe command construction practices.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require input validation and neutralization that prevent command injection.

DE.CM-09 partial match
prevents

Runtime monitoring of software and data can detect anomalous command execution resulting from injection.

ID.RA-01 partial match
prevents

Identifying recorded vulnerabilities enables remediation of command-injection flaws before exploitation.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.28 Secure coding mostly match
prevents

Secure coding standards require proper escaping and parameterization of commands, directly eliminating CWE-77.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development catches command-injection vulnerabilities before release.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle mandates input validation and command construction practices that directly prevent command injection.

A.8.26 Application security requirements partial match
prevents

Application security requirements explicitly call for controls against injection flaws including command injection.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles reduce the attack surface but do not prescribe the specific neutralization techniques needed.

A.8.31 Separation of development, test and production environments none match
none

Environment separation limits the blast radius of an exploited command injection but does not prevent the flaw itself.

References