{"id":"EM-20261110-JJGS","url":"https://cyber.eventmonitor.net/incident/EM-20261110-JJGS/action-pack-vulnerability-cve-2026-126083/","type":"cve","title":"Action Pack Vulnerability (CVE-2026-126083)","subtitle":"CVE-2026-126083","subject":"CVE-2026-126083","status":"Developing","severity":"high","affected":[],"headline":null,"born":"2026-11-10T21:20:06.000Z","firstSignal":"2026-11-10T21:19:27.133Z","lastSignal":"2026-11-10T21:20:06.000Z","updated":"2026-11-10T21:24:46.420Z","revision":1,"life":[{"status":"Born","at":"2026-11-10T21:20:06.000Z","why":"second independent source: C26 GitHub Advisory Database"},{"status":"Developing","at":"2026-11-10T21:20:06.000Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-10T21:19:27.133Z","what":"First signal: C6 NVD CVE API 2.0"},{"at":"2026-11-10T21:20:06.000Z","what":"Born: second source, C26 GitHub Advisory Database. Page EM-20261110-JJGS created."}],"stages":[{"name":"Disclosed","at":"2026-11-10T21:19:27.133Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-10T21:19:27.133Z","detail":"CVSS 7.4"},{"name":"Exploited","at":null,"detail":"No exploitation reported"},{"name":"Advisories","at":null,"detail":"None yet"},{"name":"Vendor Response","at":null,"detail":"None in sources yet"},{"name":"Resolved","at":null,"detail":"After 14 quiet days"}],"signals":[{"at":"2026-11-10T21:19:27.133Z","source":"C6","sourceName":"NVD CVE API 2.0","role":"Database","severity":3,"title":"CVE-2026-126083 (CVSS 7.4)","text":"Action Pack is a framework for handling and responding to web requests. From 8.1 until 8.1.4.1, Since Rails 8.1.0, ActionDispatch::RemoteIp derives request.remote_ip from Rack::Request#forwarded_for, which under Rack 3 reads the RFC 7239 Forwarded header in preference to X-Forwarded-For. When a reverse proxy appends the client address to X-Forwarded-For but passes a client-supplied Forwarded header through unchanged, request.remote_ip returns an address chosen by the client, and the IP spoofing check does not raise, because it compares only Client-Ip with the forwarded addresses. An…","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126083"},{"at":"2026-11-10T21:20:06.000Z","source":"C26","sourceName":"GitHub Advisory Database","role":"Database","severity":3,"title":"GHSA-2gff-2mmg-m73p / CVE-2026-126083: Action Pack: Possible IP spoofing in Action Dispatch RemoteIp","text":"rubygems:actionpack","url":"https://github.com/advisories/GHSA-2gff-2mmg-m73p"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-10T21:19:27.133","score":7.4,"severity":"HIGH","desc":"Action Pack is a framework for handling and responding to web requests. From 8.1 until 8.1.4.1, Since Rails 8.1.0, ActionDispatch::RemoteIp derives request.remote_ip from Rack::Request#forwarded_for, which under Rack 3 reads the RFC 7239 Forwarded header in preference to X-Forwarded-For. When a…","product":"","seen":1794345886420},"kev":null,"epss":null,"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}