{"id":"EM-20261105-0DZC","url":"https://cyber.eventmonitor.net/incident/EM-20261105-0DZC/modsecurity-vulnerability-cve-2026-73856/","type":"cve","title":"ModSecurity Vulnerability (CVE-2026-73856)","subtitle":"CVE-2026-73856","subject":"CVE-2026-73856","status":"Developing","severity":"high","affected":[],"headline":null,"born":"2026-11-05T16:17:48.443Z","firstSignal":"2026-11-05T15:50:09.000Z","lastSignal":"2026-11-05T16:17:48.443Z","updated":"2026-11-06T12:16:45.734Z","revision":1,"life":[{"status":"Born","at":"2026-11-05T16:17:48.443Z","why":"second independent source: C6 NVD CVE API 2.0"},{"status":"Developing","at":"2026-11-05T16:17:48.443Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-05T15:50:09.000Z","what":"First signal: C41 Red Hat Security Data"},{"at":"2026-11-05T16:17:48.443Z","what":"Born: second source, C6 NVD CVE API 2.0. Page EM-20261105-0DZC created."}],"stages":[{"name":"Disclosed","at":"2026-11-05T16:17:48.443Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-05T16:17:48.443Z","detail":"CVSS 8.6"},{"name":"Exploited","at":null,"detail":"No exploitation reported"},{"name":"Advisories","at":null,"detail":"None yet"},{"name":"Vendor Response","at":"2026-11-05T15:50:09.000Z","detail":"C41 published"},{"name":"Resolved","at":null,"detail":"After 14 quiet days"}],"signals":[{"at":"2026-11-05T15:50:09.000Z","source":"C41","sourceName":"Red Hat Security Data","role":"Vendor","severity":3,"title":"Red Hat: CVE-2026-73856 (important)","text":"modsecurity: modsecurity: Information disclosure via case-sensitive Content-Type matching","url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-73856.json"},{"at":"2026-11-05T16:17:48.443Z","source":"C6","sourceName":"NVD CVE API 2.0","role":"Database","severity":3,"title":"CVE-2026-73856 (CVSS 8.6)","text":"ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.0 until 3.0.17, src/transaction.cc compares a response Content-Type value against SecResponseBodyMimeType entries case-sensitively. A mixed-case response media type that is semantically equivalent to a configured lowercase type can therefore be treated as unconfigured, causing ModSecurity to skip RESPONSE_BODY inspection. An unauthenticated requester can then receive response content that a phase 4 rule would otherwise block, including sensitive error or debug data. This…","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73856"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-05T16:17:48.443","score":8.6,"severity":"HIGH","desc":"ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.0 until 3.0.17, src/transaction.cc compares a response Content-Type value against SecResponseBodyMimeType entries case-sensitively. A mixed-case response media type that is…","product":"","seen":1793905338609},"kev":null,"epss":null,"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}