alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS D-Link account_mgr.cgi app Parameter Command Injection Attempt (CVE-2026-4209)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:24; content:"/cgi-bin/account_mgr.cgi"; fast_pattern; http.request_body; content:"cmd|3d|"; pcre:"/^cgi\x5f(?:create\x5fimport\x5fusers|user\x5fbatch\x5fcreate)/R"; pcre:"/(?:app|overwrite)\x3d[^\x26]*?(?:(?:\x3b|%3[Bb])|(?:\x0a|%0[Aa])|(?:\x60|%60)|(?:\x7c|%7[Cc])|(?:\x24|%24))+/P"; reference:url,github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_148/148.md; reference:url,github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_149/149.md; reference:cve,2026-4209; classtype:attempted-admin; sid:2071829; rev:1; metadata:affected_product D_Link, attack_target Networking_Equipment, tls_state plaintext, created_at 2026_08_27, cve CVE_2026_4209, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, updated_at 2026_08_27, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)