ET WEB_SPECIFIC_APPS JetBrains TeamCity On-Premise Unauthenticated Remote Code Execution (CVE-2026-63077)

alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET WEB_SPECIFIC_APPS JetBrains TeamCity On-Premise Unauthenticated Remote Code Execution (CVE-2026-63077)";
    flow:established,to_server;
    http.uri;
    content:"/app/agents/v1/commands/error"; fast_pattern;
    http.header_names;
    content:"teamcity-agentsessionid|0d 0a|"; nocase;
    http.request_body;
    content:"connectionInitSqls";
    pcre:"/^(?:(?!(?:\x3e|\x25(?:25)?3[eE]|\x26(?:\x23(?:x3c|60)|lt)\x3b)(?:\x2f|\x25(?:25)?2[fF]|\x26(?:\x23(?:x2f|47)|sol)\x3b)connectionInitSqls).)+\x2egetRuntime\x28\x29/Rs";
    content:"freemarker.ext.beans.HashAdapter";
    content:"org.apache.commons.collections.keyvalue.TiedMapEntry";
    http.method;
    content:"POST";
    reference:url,www.rapid7.com/blog/post/ra-unauthenticated-rce-in-jetbrains-teamcity-cve-2026-63077/;
    reference:cve,2026-63077;
    classtype:web-application-attack;
    sid:2071433; rev:1;
    metadata:affected_product JetBrains_TeamCity, attack_target Server, tls_state TLSDecrypt, created_at 2026_08_10, cve CVE_2026_63077, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, updated_at 2026_08_10, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)