ET WEB_SPECIFIC_APPS Fortinet FortiSandbox JRPC API Path Traversal Authentication Bypass (CVE-2026-39813)

Query · suricata

flow:established,to_server;
http.uri; bsize:8;
content:"/jsonrpc"; fast_pattern;
http.request_body;
content:"|22|method|22 3a|";
content:"|22|params|22 3a|";
content:"|22|session|22 3a|";
pcre:"/^\s*\x22[^\x22]*?(?:(?:\x2e|%2[Ee]){1,2}(?:\x2f|\x5c|%5[Cc]|%2[Ff]){1,}){2,}/R";
target:dest_ip;
Raw source ET WEB_SPECIFIC_APPS Fortinet FortiSandbox JRPC API Path Traversal Authentication Bypass (CVE-2026-39813) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS Fortinet FortiSandbox JRPC API Path Traversal Authentication Bypass (CVE-2026-39813)";
    flow:established,to_server;
    http.uri; bsize:8;
    content:"/jsonrpc"; fast_pattern;
    http.request_body;
    content:"|22|method|22 3a|";
    content:"|22|params|22 3a|";
    content:"|22|session|22 3a|";
    pcre:"/^\s*\x22[^\x22]*?(?:(?:\x2e|%2[Ee]){1,2}(?:\x2f|\x5c|%5[Cc]|%2[Ff]){1,}){2,}/R";
    reference:url,rustlang.rs/posts/blog_cve_2026_39813_en/;
    reference:cve,2026-39813;
    classtype:web-application-attack;
    sid:2068935; rev:1;
    metadata:attack_target Server, tls_state TLSDecrypt, created_at 2026_04_22, cve CVE_2026_39813, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_04_22, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)

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