ET EXPLOIT Microsoft Exchange Outlook Web Access (OWA) Cross-Site Scripting (CVE-2026-42897)

Query · suricata

flow:established,to_server;
content:"Microsoft SMTP Server"; fast_pattern;
content:"|3c|img ";
content:"data|3a|image|2f|svg"; distance:0;
content:"xml|3b|base64"; within:20;
pcre:"/^[^\x22]*?on[a-z]+=[^\x22]*?[\x28\x5b\x7b]/R";
target:dest_ip;
Raw source ET EXPLOIT Microsoft Exchange Outlook Web Access (OWA) Cross-Site Scripting (CVE-2026-42897) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert smtp any any -> [$HOME_NET,$SMTP_SERVERS] any (
    msg:"ET EXPLOIT Microsoft Exchange Outlook Web Access (OWA) Cross-Site Scripting (CVE-2026-42897)";
    flow:established,to_server;
    content:"Microsoft SMTP Server"; fast_pattern;
    content:"|3c|img ";
    content:"data|3a|image|2f|svg"; distance:0;
    content:"xml|3b|base64"; within:20;
    pcre:"/^[^\x22]*?on[a-z]+=[^\x22]*?[\x28\x5b\x7b]/R";
    reference:cve,2026-42897;
    classtype:web-application-attack;
    sid:2071330; rev:1;
    metadata:affected_product Microsoft_Exchange, attack_target Server, created_at 2026_07_28, cve CVE_2026_42897, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, updated_at 2026_07_28, former_sid 2868078, 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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