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CVE-2026-40856 is a missing-authentication/improper-access-control vulnerability in WNC T-Mobile 5G Box IDU router firmware versions earlier than 1.1.0.651412. An unauthenticated router interface exposes sensitive configuration data to remote requesters, including the administrator web password, Wi-Fi passphrase, and technical device information.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A missing-authentication and improper-access-control flaw in the unauthenticated wnc_maccheck.cgi endpoint of WNC T-Mobile 5G Box IDU routers, exposing administrator credentials, Wi-Fi passphrases, and device information.
A reported vulnerability in the firmware of WNC T-Mobile 5G Box IDU routers; no technical details are provided.
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.