{"id":"CVE-2026-124900","kind":"vulnerability","aliases":["CVE-2026-124900"],"related":[],"title":"Firefox: use-after-free in Service Workers lets a web page escape its sandbox","description":"Sandbox escape due to use-after-free in the DOM: Service Workers component. This vulnerability was fixed in Firefox 160.","summary":"A use-after-free bug in the DOM Service Workers component of Firefox allows a sandbox escape. The sources say it was fixed in Firefox 160 but give no details on what an attacker can run once the sandbox is escaped.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Firefox","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["browser","firefox","package"],"not_affected_if":[],"how_to_check":"- Check the installed Firefox version, for example in the About Firefox dialog, and compare it with `160`.","fix":"- Firefox: `160`","status":"open","published_at":"2026-11-10T14:17:23+00:00","first_seen_at":"2026-11-10T14:22:16+00:00","triaged_at":"2026-11-10T14:24:52+00:00","updated_at":"2026-11-10T14:24:52+00:00","category":"package","confidence":0.5,"triage":{"at":"2026-11-10T14:24:52Z","model":"claude-haiku-5-5","output":{"fix":"- Firefox: `160`","reach":"internet","title":"Firefox: use-after-free in Service Workers lets a web page escape its sandbox","impact":"high","summary":"A use-after-free bug in the DOM Service Workers component of Firefox allows a sandbox escape. The sources say it was fixed in Firefox 160 but give no details on what an attacker can run once the sandbox is escaped.","audience":"everyone","category":"package","nicknames":[],"who_cares":["firefox","browser"],"confidence":0.5,"fix_status":"available","needs_auth":"unknown","worst_case":"Web page content escapes the browser sandbox and reaches the machine","analyst_note":"Confirm the affected Firefox ranges and exploitation conditions from the Mozilla advisory for this CVE.","how_to_check":"- Check the installed Firefox version, for example in the About Firefox dialog, and compare it with `160`.\n- unknown beyond this if the sources do not say more.","plain_action":"Update Firefox to version 160 or later through its built-in update check.","product_name":"Firefox","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000678,"input_tokens":4479,"output_tokens":460,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124900':18A,21A '-2026':17A,20A '160':52B,88C 'allow':40B 'attack':60B 'browser':23B 'bug':31B 'compon':37B,81C 'cve':16A,19A 'detail':56B 'dom':34B,78C 'due':70C 'escap':13A,43B,67B,69C 'firefox':1A,22A,24B,39B,51B,87C 'fix':49B,85C 'free':5A,30B,75C 'give':54B 'let':9A 'packag':25B 'page':12A 'run':62B 'sandbox':15A,42B,65B,68C 'say':46B 'servic':7A,35B,79C 'sourc':45B 'use':3A,28B,73C 'use-after-fre':2A,27B,72C 'vulner':83C 'web':11A 'worker':8A,36B,80C","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 later through its built-in update check.","pkeys":["firefox"],"ptokens":["firefox"],"labels":["browser","firefox","package","unknown","vendor"],"campaign_type":null,"search_a":"'-124900':18A,21A '-2026':17A,20A 'cve':16A,19A 'escap':13A 'firefox':1A,22A 'free':5A 'let':9A 'page':12A 'sandbox':15A 'servic':7A 'use':3A 'use-after-fre':2A 'web':11A 'worker':8A","search_b":"'160':52B 'allow':40B 'attack':60B 'browser':23B 'bug':31B 'compon':37B 'detail':56B 'dom':34B 'escap':43B,67B 'firefox':24B,39B,51B 'fix':49B 'free':30B 'give':54B 'packag':25B 'run':62B 'sandbox':42B,65B 'say':46B 'servic':35B 'sourc':45B 'use':28B 'use-after-fre':27B 'worker':36B","search_c":"'160':88C 'compon':81C 'dom':78C 'due':70C 'escap':69C 'firefox':87C 'fix':85C 'free':75C 'sandbox':68C 'servic':79C 'use':73C 'use-after-fre':72C 'vulner':83C 'worker':80C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T14:17:23+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124900","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124900","severity":null,"published_at":"2026-11-10T14:17:23+00:00","modified_at":"2026-11-10T14:17:23+00:00","first_seen_at":"2026-11-10T14:22:16+00:00","fetched_at":"2026-11-10T14:22:16+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"}