CVE-2026-12187Public exploitNetwork attack vector

Authenticated root command execution via unquoted firmware URL

Published Jun 14, 2026 · Updated Jun 14, 2026

Command injection in GL.iNet GL-MT3000 firmware 4.4.0 through 4.4.5 allows remote authenticated users to execute commands as root. The upgrade RPC handler inserts params.url into an unquoted shell command passed to os.execute, while one_click_upgrade also expands an unquoted firmware path. Access requires an authenticated router session; shell metacharacters in the URL execute before checksum failure stops the firmware flash.

CVSS severity8.7
High
EPSS probability1.94%
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-MT3000 firmware 4.4.0 through 4.4.5 allows remote authenticated users to execute commands as root. The upgrade RPC handler inserts params.url into an unquoted shell command passed to os.execute, while one_click_upgrade also expands an unquoted firmware path. Access requires an authenticated router session; shell metacharacters in the URL execute before checksum failure stops the firmware flash.

The record

CVE
CVE-2026-12187
Published
Jun 14, 2026
Updated
Jun 14, 2026
Vendor
GL.iNet
Product
GL-MT3000
Classifications
CWE-74, CWE-77, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 privilegesauthenticated

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

9.0VulDB CNAAV:N/AC:L/Au:S/C:C/I:C/A:C
8.7VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command 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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