Command Injection in GL.iNet GL-MT3000 Online Firmware Upgrade Handler
CVE-2026-12187 is a remotely exploitable command injection vulnerability affecting GL.iNet GL-MT3000 devices running firmware up to version 4.4.5. The flaw is reported in an unknown functionality within /usr/bin/one_click_upgrade, the Online Firmware Upgrade Handler. By manipulating input handled by this upgrade mechanism, an attacker can trigger command injection on the device. Public exploit disclosure has been noted. The issue is fixed in firmware version 4.7.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Recent activity
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.