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CVE-2026-40857 is a cross-site request forgery vulnerability in WNC T-Mobile 5G Box IDU router firmware prior to version 1.1.0.651412. The router’s anti-CSRF implementation accepts arbitrary values for the CSRF-token request parameter rather than validating that the token is valid and bound to the authenticated session. Consequently, attacker-controlled web content can cause an authenticated user’s browser to submit unauthorized management requests to the router.
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No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A cross-site request forgery vulnerability in the portal.cgi component of WNC T-Mobile 5G Box IDU routers. Arbitrary csrf_token_value values are accepted, permitting unauthorized device actions through an authenticated victim.
A high-severity CSRF-token validation bypass in the portal.cgi component of WNC T-Mobile 5G Box IDU routers. Arbitrary csrf_token_value values are accepted, allowing unauthorized device actions when an authenticated user is induced to visit an attacker-controlled website.
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.