Identifies the network signature of CVE-2026-41940, a pre-auth root-level authentication bypass in cPanel and WebHost Manager (WHM) caused by a CRLF injection in the session writer. The exploit-inherent shape on the wire is a "GET /" request to a cPanel/WHM admin port (typically TCP/2087, 2086, 2083, 2082, 2095, 2096) carrying an "Authorization: Basic" header whose base64-decoded value contains CRLF-injected session fields, which causes cpsrvd to respond with a 3xx redirect whose "Location" header leaks a "/cpsessNNNNNNNNNN" token granting the attacker a privileged session. This is the network-layer equivalent of the cPanel "access_log" artifact identified by Unfold and watchTowr as the first bulletproof detection for this CVE: a "GET /" recorded with "auth_method=b" (HTTP Basic). Legitimate access to "GET /" on a WHM admin port returns 200 with the login screen and never includes HTTP Basic credentials, so this combination is not produced by normal use.

0 exclusive techniques.This is coverage no other published rule has; it is not this rule's total technique count.