ET WEB_SPECIFIC_APPS Langflow File Upload Directory Traversal/Remote Code Execution Attempt (CVE-2026-5027)
Sourceet/open
Fileemerging-web_specific_apps.rules
CreatedJune 25, 2026
UpdatedJune 25, 2026
Classificationattempted-admin
alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Langflow File Upload Directory Traversal/Remote Code Execution Attempt (CVE-2026-5027)"; flow:established,to_server ; http.method; content:"POST"; http.uri; bsize:13; content:"/api/v2/files"; fast_pattern; http.request_body; content:"filename|3d 22|"; pcre:"/^[^\x26]*?(?:(?:\x2e|%2[Ee]){1,2}(?:\x2f|\x5c|%5[Cc]|%2[Ff]){1,}){2,}/R" ; reference:url,yh.do/cve-2026-5027-langflow-path-traversal-rce/ ; reference:cve,2026-5027 ; classtype:attempted-admin; sid:2070061; rev:1; metadata:affected_product Langflow, attack_target Web_Server, tls_state plaintext, created_at 2026_06_25, cve CVE_2026_5027, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, updated_at 2026_06_25, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)
References
Metadata
affected productLangflow
attack targetWeb_Server
tls stateplaintext
created at2026_06_25
deploymentInternal
performance impactLow
confidenceHigh
signature severityMajor
tagExploit
updated at2026_06_25
mitre tactic idTA0001
mitre tactic nameInitial_Access
mitre technique idT1190
mitre technique nameExploit_Public_Facing_Application
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