CVE-2026-26794

HighPublic PoC

Published: 12 March 2026

Published

12 March 2026

Modified

16 March 2026

KEV Added

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Patch

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CVSS Score 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0027 50.3th percentile

Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-26794 is a high-severity SQL Injection (CWE-89) vulnerability in Gl-Inet Ar300M16 Firmware. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 49.7% 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 are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-10 Information Input Validation good match

prevent

Directly requires validation and sanitization of unsanitized user inputs to the add_group() function to prevent arbitrary SQL execution via crafted HTTP requests.

SI-2 Flaw Remediation good match

prevent

Mandates timely remediation of the specific SQL injection flaw in GL-iNet GL-AR300M16 firmware v4.3.11 to eliminate the vulnerability.

SI-9 Information Input Restrictions partial match

prevent

Enforces restrictions on HTTP request inputs such as length limits and allowed characters to block oversized or malformed SQL injection payloads.

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 →

T1213.006 Databases Collection

Adversaries may leverage databases to mine valuable information.

attack.mitre.org →

Why these techniques?

SQL injection in web interface enables exploitation of public-facing application (T1190) and arbitrary SQL operations facilitating data collection from databases (T1213.006).

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

NVD Description

GL-iNet GL-AR300M16 v4.3.11 was discovered to contain a SQL injection vulnerability via the add_group() function. This vulnerability allows attackers to execute arbitrary SQL database operations via a crafted HTTP request.

Deeper analysisAI

CVE-2026-26794 is a SQL injection vulnerability (CWE-89) affecting the GL-iNet GL-AR300M16 router on firmware version 4.3.11. The issue exists in the add_group() function, which does not properly sanitize user inputs, enabling attackers to execute arbitrary SQL database operations via a crafted HTTP request. Published on 2026-03-12, 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), reflecting its high severity due to network accessibility and significant impacts.

The vulnerability can be exploited by low-privileged users (PR:L) who can send a specially crafted HTTP request over the network with low attack complexity and no user interaction required. Successful exploitation grants attackers the ability to perform arbitrary SQL operations on the device's database, leading to high confidentiality, integrity, and availability impacts, such as data exfiltration, modification, or denial of service.

A reference to a proof-of-concept exploit is available at https://github.com/sezangel/IOT-vul/tree/main/GL-iNet/GL-AR300M16/acl--add_group. No vendor advisories or patches are detailed in the provided information.