{"id":"EM-20261112-3OMW","url":"https://cyber.eventmonitor.net/incident/EM-20261112-3OMW/action-pack-vulnerability-cve-2026-126081/","type":"cve","title":"Action Pack Vulnerability (CVE-2026-126081)","subtitle":"CVE-2026-126081","subject":"CVE-2026-126081","status":"Developing","severity":"high","affected":[],"headline":null,"born":"2026-11-12T23:37:09.000Z","firstSignal":"2026-11-10T21:19:26.817Z","lastSignal":"2026-11-12T23:37:09.000Z","updated":"2026-11-13T00:40:17.050Z","revision":1,"life":[{"status":"Born","at":"2026-11-12T23:37:09.000Z","why":"second independent source: C26 GitHub Advisory Database"},{"status":"Developing","at":"2026-11-12T23:37:09.000Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-10T21:19:26.817Z","what":"First signal: C6 NVD CVE API 2.0"},{"at":"2026-11-12T23:37:09.000Z","what":"Born: second source, C26 GitHub Advisory Database. Page EM-20261112-3OMW created."}],"stages":[{"name":"Disclosed","at":"2026-11-10T21:19:26.817Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-10T21:19:26.817Z","detail":"CVSS 7.5 · EPSS 0.6%"},{"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":"2026-11-10T21:19:26.817Z","source":"C6","sourceName":"NVD CVE API 2.0","role":"Database","severity":3,"title":"CVE-2026-126081 (CVSS 7.5)","text":"Action Pack is a framework for handling and responding to web requests. Prior to 8.1.4.1 and 8.0.5.2, ActionController::Parameters#each_key delegates to the internal ActiveSupport::HashWithIndifferentAccess that holds the request parameters, so when called with a block it returns that hash instead of the Parameters instance. The hash does not respond to permitted?, so Active Model mass assignment (new, assign_attributes, update) accepts it without raising ActiveModel::ForbiddenAttributesError. An application that passes the return value of each_key to mass assignment could allow a remote…","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126081"},{"at":"2026-11-12T23:37:09.000Z","source":"C26","sourceName":"GitHub Advisory Database","role":"Database","severity":3,"title":"GHSA-wm3x-v3qw-4jh3 / CVE-2026-126081: Action Pack: Possible Strong Parameters Bypass in Parameters#each_key","text":"rubygems:actionpack, rubygems:actionpack","url":"https://github.com/advisories/GHSA-wm3x-v3qw-4jh3"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-10T21:19:26.817","score":7.5,"severity":"HIGH","desc":"Action Pack is a framework for handling and responding to web requests. Prior to 8.1.4.1 and 8.0.5.2, ActionController::Parameters#each_key delegates to the internal ActiveSupport::HashWithIndifferentAccess that holds the request parameters, so when called with a block it returns that hash instead…","product":"","seen":1794530417050},"kev":null,"epss":{"epss":0.00625,"pct":0.50489,"at":1794530417050},"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}