{"id":"CVE-2026-124914","kind":"vulnerability","aliases":["CVE-2026-124914"],"related":[],"title":"Firefox: navigation flaw can break site isolation in the DOM","description":"Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.","summary":"A site isolation flaw in the DOM Navigation component of Firefox lets one website interfere with content from another site. The sources do not say what an attacker can read or change once the isolation is broken.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","firefox","runtime"],"not_affected_if":["up-to-date-firefox"],"how_to_check":"- Check the installed Firefox version (Help > About Firefox), which the sources do not give a command for.","fix":"- Firefox: `160`\n- Firefox ESR: `153.7`","status":"open","published_at":"2026-11-10T14:17:25+00:00","first_seen_at":"2026-11-10T14:22:17+00:00","triaged_at":"2026-11-10T14:24:38+00:00","updated_at":"2026-11-10T14:24:38+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-11-10T14:24:38Z","model":"claude-haiku-5-5","output":{"fix":"- Firefox: `160`\n- Firefox ESR: `153.7`","reach":"internet","title":"Firefox: navigation flaw can break site isolation in the DOM","impact":"medium","summary":"A site isolation flaw in the DOM Navigation component of Firefox lets one website interfere with content from another site. The sources do not say what an attacker can read or change once the isolation is broken.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["firefox","browser"],"confidence":0.5,"fix_status":"available","needs_auth":"unknown","worst_case":"unknown; site isolation may be bypassed across websites","analyst_note":"Confirm from the Mozilla advisory what an attacker can read or change across sites, and whether user interaction is needed.","how_to_check":"- Check the installed Firefox version (Help > About Firefox), which the sources do not give a command for.\n- unknown","plain_action":"Update Firefox to version 160 or Firefox ESR to 153.7 through Firefox's own update settings.","product_name":"","needs_analyst":true,"not_affected_if":["up-to-date-firefox"],"who_is_affected":"Anyone running a Firefox build older than 160 or Firefox ESR older than 153.7. The sources do not describe any extra configuration or account needed to trigger it.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000695,"input_tokens":4476,"output_tokens":495,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124914':13A,16A '-2026':12A,15A '153.7':75C '160':71C 'anoth':38B 'attack':47B 'break':5A 'broken':56B 'browser':17B 'chang':51B 'compon':28B,64C 'content':36B 'cve':11A,14A 'dom':10A,26B,62C 'esr':74C 'firefox':1A,18B,30B,70C,73C 'fix':68C 'flaw':3A,23B 'interfer':34B 'isol':7A,22B,54B,58C 'issu':59C 'let':31B 'navig':2A,27B,63C 'one':32B 'read':49B 'runtim':19B 'say':44B 'site':6A,21B,39B,57C 'sourc':41B 'vulner':66C 'websit':33B","nicknames":[],"mitigations":[],"who_affected":"Anyone running a Firefox build older than 160 or Firefox ESR older than 153.7. The sources do not describe any extra configuration or account needed to trigger it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Firefox to version 160 or Firefox ESR to 153.7 through Firefox's own update settings.","pkeys":[],"ptokens":[],"labels":["browser","firefox","runtime","unknown"],"campaign_type":null,"search_a":"'-124914':13A,16A '-2026':12A,15A 'break':5A 'cve':11A,14A 'dom':10A 'firefox':1A 'flaw':3A 'isol':7A 'navig':2A 'site':6A","search_b":"'anoth':38B 'attack':47B 'broken':56B 'browser':17B 'chang':51B 'compon':28B 'content':36B 'dom':26B 'firefox':18B,30B 'flaw':23B 'interfer':34B 'isol':22B,54B 'let':31B 'navig':27B 'one':32B 'read':49B 'runtim':19B 'say':44B 'site':21B,39B 'sourc':41B 'websit':33B","search_c":"'153.7':75C '160':71C 'compon':64C 'dom':62C 'esr':74C 'firefox':70C,73C 'fix':68C 'isol':58C 'issu':59C 'navig':63C 'site':57C 'vulner':66C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T14:17:25+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124914","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124914","severity":null,"published_at":"2026-11-10T14:17:25+00:00","modified_at":"2026-11-10T14:17:25+00:00","first_seen_at":"2026-11-10T14:22:17+00:00","fetched_at":"2026-11-10T14:22:17+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"}