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

SID: 2068935Rev: 18 views

Sourceet/open

CreatedApril 22, 2026

UpdatedApril 22, 2026

Classificationweb-application-attack

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;)

References

url	rustlang.rs/posts/blog_cve_2026_39813_en/
cve	2026-39813

Metadata

attack targetServer

tls stateTLSDecrypt

created at2026_04_22

cveCVE-2026-39813

deploymentSSLDecrypt

confidenceHigh

signature severityMajor

tagExploit

updated at2026_04_22

mitre tactic idTA0001

mitre tactic nameInitial_Access

mitre technique idT1190

mitre technique nameExploit_Public_Facing_Application

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