ET WEB_SPECIFIC_APPS SmarterTools SmarterMail Arbitrary File Upload Attempt (CVE-2025-52691)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/api/upload";
http.content_type;
content:"multipart/form-data|3b|"; startswith;
http.request_body; strip_whitespace;
content:"|7b 22|guid|22 3a 22|dag"; fast_pattern;
pcre:"/^[^\x26]*?(?:(?:\x2e|%2[Ee]){1,2}(?:\x2f|\x5c|%5[Cc]|%2[Ff]){1,}){2,}/R";
Raw source ET WEB_SPECIFIC_APPS SmarterTools SmarterMail Arbitrary File Upload Attempt (CVE-2025-52691) · 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 SmarterTools SmarterMail Arbitrary File Upload Attempt (CVE-2025-52691)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/api/upload";
    http.content_type;
    content:"multipart/form-data|3b|"; startswith;
    http.request_body; strip_whitespace;
    content:"|7b 22|guid|22 3a 22|dag"; fast_pattern;
    pcre:"/^[^\x26]*?(?:(?:\x2e|%2[Ee]){1,2}(?:\x2f|\x5c|%5[Cc]|%2[Ff]){1,}){2,}/R";
    reference:url,labs.watchtowr.com/do-smart-people-ever-say-theyre-smart-smartertools-smartermail-pre-auth-rce-cve-2025-52691/;
    reference:url,github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-52691.yaml;
    reference:cve,2025-52691;
    classtype:attempted-admin;
    sid:2066715; rev:2;
    metadata:affected_product SmarterTools_SmarterMail, attack_target Server, tls_state TLSDecrypt, created_at 2026_01_13, cve CVE_2025_52691, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, updated_at 2026_07_31;
)

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