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CVE-2026-18686 is a remote command injection vulnerability affecting GL.iNet GL-MT3000 firmware through version 4.4.5, including versions 4.4.0 through 4.4.5. The flaw is present in the nas-web RPC Wrapper component, specifically in the nas-web.add_user function implemented in the /cgi-bin/glc handler. Improper neutralization of attacker-controlled input allows crafted data supplied to this function to be interpreted as operating system commands. Successful exploitation can be performed remotely and public exploit information is available. The vendor has confirmed the existence of the vulnerability.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.