{"id":"CVE-2026-124854","kind":"vulnerability","aliases":["CVE-2026-124854"],"related":[],"title":"Firefox: DOM Navigation flaw allows privilege escalation in browser","description":"Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.","summary":"A flaw in the DOM Navigation component of Firefox allows privilege escalation. The sources do not say what an attacker gains beyond that, or how it is triggered.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","firefox","runtime"],"not_affected_if":["already-on-fixed-version"],"how_to_check":"- Check the Firefox version with `firefox --version` or Help > About Firefox\n- Compare against the fixed releases named in the sources: Firefox 160 and Firefox ESR 153.7","fix":"- Firefox: `160` or later\n- Firefox ESR: `153.7` or later","status":"open","published_at":"2026-11-10T14:17:17+00:00","first_seen_at":"2026-11-10T14:22:13+00:00","triaged_at":"2026-11-10T14:26:43+00:00","updated_at":"2026-11-10T14:26:43+00:00","category":"runtime","confidence":0.4,"triage":{"at":"2026-11-10T14:26:43Z","model":"claude-haiku-5-5","output":{"fix":"- Firefox: `160` or later\n- Firefox ESR: `153.7` or later","reach":"unknown","title":"Firefox: DOM Navigation flaw allows privilege escalation in browser","impact":"high","summary":"A flaw in the DOM Navigation component of Firefox allows privilege escalation. The sources do not say what an attacker gains beyond that, or how it is triggered.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["firefox","browser"],"confidence":0.4,"fix_status":"available","needs_auth":"unknown","worst_case":"unknown privilege escalation within the browser","analyst_note":"Read the Mozilla advisory for CVE-2026-124854 to confirm the trigger, exposure and attacker gain; the sources given only name the fixed versions.","how_to_check":"- Check the Firefox version with `firefox --version` or Help > About Firefox\n- Compare against the fixed releases named in the sources: Firefox 160 and Firefox ESR 153.7","plain_action":"Update Firefox to version 160 (or Firefox ESR 153.7) through its built-in update check: Menu > Settings > General > Firefox Updates.","product_name":"","needs_analyst":true,"not_affected_if":["already-on-fixed-version"],"who_is_affected":"unknown","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000697,"input_tokens":4476,"output_tokens":499,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124854':12A,15A '-2026':11A,14A '153.7':64C '160':60C 'allow':5A,28B 'attack':38B 'beyond':40B 'browser':9A,16B 'compon':25B,53C 'cve':10A,13A 'dom':2A,23B,51C 'escal':7A,30B,48C 'esr':63C 'firefox':1A,17B,27B,59C,62C 'fix':57C 'flaw':4A,20B 'gain':39B 'navig':3A,24B,52C 'privileg':6A,29B,47C 'runtim':18B 'say':35B 'sourc':32B 'trigger':46B 'vulner':55C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Firefox to version 160 (or Firefox ESR 153.7) through its built-in update check: Menu > Settings > General > Firefox Updates.","pkeys":[],"ptokens":[],"labels":["browser","firefox","runtime","unknown"],"campaign_type":null,"search_a":"'-124854':12A,15A '-2026':11A,14A 'allow':5A 'browser':9A 'cve':10A,13A 'dom':2A 'escal':7A 'firefox':1A 'flaw':4A 'navig':3A 'privileg':6A","search_b":"'allow':28B 'attack':38B 'beyond':40B 'browser':16B 'compon':25B 'dom':23B 'escal':30B 'firefox':17B,27B 'flaw':20B 'gain':39B 'navig':24B 'privileg':29B 'runtim':18B 'say':35B 'sourc':32B 'trigger':46B","search_c":"'153.7':64C '160':60C 'compon':53C 'dom':51C 'escal':48C 'esr':63C 'firefox':59C,62C 'fix':57C 'navig':52C 'privileg':47C 'vulner':55C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T14:17:17+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124854","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124854","severity":null,"published_at":"2026-11-10T14:17:17+00:00","modified_at":"2026-11-10T14:17:17+00:00","first_seen_at":"2026-11-10T14:22:13+00:00","fetched_at":"2026-11-10T14:22:13+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}