CVE-2026-18613Public exploitNetwork attack vector

Root code execution via unauthenticated feed injection

Published Aug 3, 2026 · Updated Aug 3, 2026

Injection in GL.iNet Beryl AX firmware 4.4.0 through 4.4.5 allows remote attackers to execute code as root via crafted plugin requests. At /cgi-bin/glc, plugins.set_config writes attacker-controlled opkg feed names and URLs to /etc/opkg/customfeeds.conf without authentication or URL-scheme validation. Unauthenticated access to the router's management interface permits repository refresh and package installation from that feed, so package scripts run with root privileges.

CVSS severity9.8
Critical
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Injection in GL.iNet Beryl AX firmware 4.4.0 through 4.4.5 allows remote attackers to execute code as root via crafted plugin requests. At /cgi-bin/glc, plugins.set_config writes attacker-controlled opkg feed names and URLs to /etc/opkg/customfeeds.conf without authentication or URL-scheme validation. Unauthenticated access to the router's management interface permits repository refresh and package installation from that feed, so package scripts run with root privileges.

The record

CVE
CVE-2026-18613
Published
Aug 3, 2026
Updated
Aug 3, 2026
Vendor
GL.iNet
Product
GL-MT3000
Classifications
CWE-707, CWE-74, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.4.0
  2. Affected versionversion=4.4.1
  3. Affected versionversion=4.4.2
  4. Affected versionversion=4.4.3
  5. Affected versionversion=4.4.4
  6. Affected versionversion=4.4.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GL.iNet · GL-MT3000version=4.4.0; version=4.4.1; version=4.4.2; version=4.4.3; version=4.4.4; version=4.4.5

Published CVSS scores

10.0VulDBAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
9.8VulDBCVSS:3.0/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-707Improper Neutralization
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1190Exploit Public-Facing Application

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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