Cyber Resilience

CVE-2026-26794

HighPublic PoC

Published: 12 March 2026

Published
12 March 2026
Modified
16 March 2026
KEV Added
—
Patch
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CVSS Score v3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0045 36.0th percentile
Risk Priority 55 floored blend · peak EPSS

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 at the 36.0th percentile by exploit likelihood (below the median); 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).

Deeper analysis

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.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability details

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.

CWE(s)
CWE-89

Related Threats

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

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-2026-26795Same product: Gl-Inet Ar300M16
CVE-2018-25199Shared CWE-89
CVE-2026-27179Shared CWE-89
CVE-2025-0308Shared CWE-89
CVE-2019-25581Shared CWE-89
CVE-2026-27885Shared CWE-89
CVE-2019-25479Shared CWE-89

Affected Assets

gl-inet
ar300m16 firmware
4.3.11

Mitigating Controls

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.

References