{"id":"CVE-2026-124910","kind":"vulnerability","aliases":["CVE-2026-124910"],"related":[],"title":"Firefox: WebExtensions mitigation bypass fixed in Firefox 160","description":"Mitigation bypass in the WebExtensions component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.","summary":"A mitigation bypass in Firefox's WebExtensions component weakens a protection meant to stop extension-based attacks. The sources do not say what an attacker can do beyond bypassing that mitigation.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser-extensions","firefox","runtime"],"not_affected_if":[],"how_to_check":"- Check the Firefox version with Help > About Firefox; versions below `160` (or ESR below `153.7`) are listed as affected in the sources.","fix":"- Firefox `160`\n- Firefox ESR `153.7`","status":"open","published_at":"2026-11-10T14:17:24+00:00","first_seen_at":"2026-11-10T14:22:17+00:00","triaged_at":"2026-11-10T14:24:41+00:00","updated_at":"2026-11-10T14:24:41+00:00","category":"runtime","confidence":0.4,"triage":{"at":"2026-11-10T14:24:41Z","model":"claude-haiku-5-5","output":{"fix":"- Firefox `160`\n- Firefox ESR `153.7`","reach":"unknown","title":"Firefox: WebExtensions mitigation bypass fixed in Firefox 160","impact":"medium","summary":"A mitigation bypass in Firefox's WebExtensions component weakens a protection meant to stop extension-based attacks. The sources do not say what an attacker can do beyond bypassing that mitigation.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["firefox","browser-extensions"],"confidence":0.4,"fix_status":"available","needs_auth":"unknown","worst_case":"unknown","analyst_note":"Check the Mozilla Firefox security advisory for CVE-2026-124910 to confirm the attack impact and reach.","how_to_check":"- Check the Firefox version with Help > About Firefox; versions below `160` (or ESR below `153.7`) are listed as affected in the sources.\n- unknown","plain_action":"Update Firefox to version 160 or Firefox ESR 153.7 to fix a security flaw in its browser extension system.","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000684,"input_tokens":4474,"output_tokens":473,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124910':11A,14A '-2026':10A,13A '153.7':68C '160':8A,64C 'attack':37B,45B 'base':36B 'beyond':48B 'browser':16B 'browser-extens':15B 'bypass':4A,22B,49B,53C 'compon':27B,57C 'cve':9A,12A 'esr':67C 'extens':17B,35B 'extension-bas':34B 'firefox':1A,7A,18B,24B,63C,66C 'fix':5A,61C 'meant':31B 'mitig':3A,21B,51B,52C 'protect':30B 'runtim':19B 'say':42B 'sourc':39B 'stop':33B 'vulner':59C 'weaken':28B 'webextens':2A,26B,56C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":null,"pkeys":[],"ptokens":[],"labels":["browserextensions","firefox","runtime","unknown"],"campaign_type":null,"search_a":"'-124910':11A,14A '-2026':10A,13A '160':8A 'bypass':4A 'cve':9A,12A 'firefox':1A,7A 'fix':5A 'mitig':3A 'webextens':2A","search_b":"'attack':37B,45B 'base':36B 'beyond':48B 'browser':16B 'browser-extens':15B 'bypass':22B,49B 'compon':27B 'extens':17B,35B 'extension-bas':34B 'firefox':18B,24B 'meant':31B 'mitig':21B,51B 'protect':30B 'runtim':19B 'say':42B 'sourc':39B 'stop':33B 'weaken':28B 'webextens':26B","search_c":"'153.7':68C '160':64C 'bypass':53C 'compon':57C 'esr':67C 'firefox':63C,66C 'fix':61C 'mitig':52C 'vulner':59C 'webextens':56C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T14:17:24+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124910","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124910","severity":null,"published_at":"2026-11-10T14:17:24+00:00","modified_at":"2026-11-10T14:17:24+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"}