ET WEB_SPECIFIC_APPS Mailcow Second-Order SQL Injection via quarantine_category (CVE-2026-40871)

Query · suricata

flow:established,to_server;
http.uri;
content:"/api/v1/add/mailbox"; fast_pattern;
http.header;
content:"x-api-key|3a 20|"; nocase;
http.request_body;
content:"|22|quarantine_category|22 3a|";
pcre:"/^\s*\x22[^\x22]*?(?:[\x27\x22\x3b\x2d\x5c\x2a\x2f]|\x25(?:2[27aAdDfF]|3[bB]|5[cC]))/R";
target:dest_ip;
Raw source ET WEB_SPECIFIC_APPS Mailcow Second-Order SQL Injection via quarantine_category (CVE-2026-40871) · 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 Mailcow Second-Order SQL Injection via quarantine_category (CVE-2026-40871)";
    flow:established,to_server;
    http.uri;
    content:"/api/v1/add/mailbox"; fast_pattern;
    http.header;
    content:"x-api-key|3a 20|"; nocase;
    http.request_body;
    content:"|22|quarantine_category|22 3a|";
    pcre:"/^\s*\x22[^\x22]*?(?:[\x27\x22\x3b\x2d\x5c\x2a\x2f]|\x25(?:2[27aAdDfF]|3[bB]|5[cC]))/R";
    reference:url,github.com/lukehebe/Vulnerability-Disclosures/blob/main/CVE-2026-40871.md;
    reference:cve,2026-40871;
    classtype:web-application-attack;
    sid:2068893; rev:1;
    metadata:attack_target Server, tls_state TLSDecrypt, created_at 2026_04_21, cve CVE_2026_40871, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_04_21, 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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