CVE-2026-26791Public exploitNetwork attack vector

Remote command execution via unsanitized port parameter

Published Mar 12, 2026 · Updated Mar 12, 2026

Command injection in GL-iNet GL-AR300M16 4.3.11 allows remote attackers to execute arbitrary commands through the JSON-RPC interface. The enable_echo_server function embeds the attacker-controlled string port value into multiple system commands without validation and passes them to system(). The published proof of concept requires a valid administrator token, although NVD and CISA score the flaw as requiring no privileges; successful execution runs commands with elevated privileges.

CVSS severity9.8
Critical
EPSS probability2.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in GL-iNet GL-AR300M16 4.3.11 allows remote attackers to execute arbitrary commands through the JSON-RPC interface. The enable_echo_server function embeds the attacker-controlled string port value into multiple system commands without validation and passes them to system(). The published proof of concept requires a valid administrator token, although NVD and CISA score the flaw as requiring no privileges; successful execution runs commands with elevated privileges.

The record

CVE
CVE-2026-26791
Published
Mar 12, 2026
Updated
Mar 12, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, CAPEC-248, T1059.004
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CAPEC-248Command Injection
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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