ET WEB_SPECIFIC_APPS Gitea API Authentication Bypass (CVE-2026-20896)

Query · suricata

flow:established,to_server;
http.uri;
content:"/api/v1/user"; fast_pattern;
http.header;
content:"authorization|3a 20|token|20|"; nocase;
pcre:"/^[^\x0d\x0a]*?(?:(?:\x2e|%+(?:25)?2[Ee]|%+(?:25)?32%+(?:25)?[46]5|%+[cC]0%+[aA][eE]){1,2}(?:\x2f|\x5c|%+(?:25)?(?:25)?5[Cc]|%+(?:25)?2[Ff]|%+[cC]0%+[aA][fF]){1,}){2,}/R";
target:dest_ip;
Raw source ET WEB_SPECIFIC_APPS Gitea API Authentication Bypass (CVE-2026-20896) · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET WEB_SPECIFIC_APPS Gitea API Authentication Bypass (CVE-2026-20896)";
    flow:established,to_server;
    http.uri;
    content:"/api/v1/user"; fast_pattern;
    http.header;
    content:"authorization|3a 20|token|20|"; nocase;
    pcre:"/^[^\x0d\x0a]*?(?:(?:\x2e|%+(?:25)?2[Ee]|%+(?:25)?32%+(?:25)?[46]5|%+[cC]0%+[aA][eE]){1,2}(?:\x2f|\x5c|%+(?:25)?(?:25)?5[Cc]|%+(?:25)?2[Ff]|%+[cC]0%+[aA][fF]){1,}){2,}/R";
    reference:url,github.com/kaleth4/CVE-2026-20896;
    reference:cve,2026-20896;
    classtype:web-application-attack;
    sid:2071138; rev:1;
    metadata:affected_product Gitea, attack_target Server, tls_state TLSDecrypt, created_at 2026_07_09, cve CVE_2026_20896, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_07_09, 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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