{"id":"CVE-2019-11708","kind":"vulnerability","aliases":["CVE-2019-11708"],"related":[],"title":"Mozilla Firefox and Thunderbird: Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability","description":"Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxed parent process opening web content chosen by a compromised child process. When combined with additional vulnerabilities this could result in executing arbitrary code on the user's computer. This vulnerability affects Firefox ESR < 60.7.2, Firefox < 67.0.4, and Thunderbird < 60.7.2.","summary":"Mozilla Firefox and Thunderbird contain a sandbox escape flaw that is listed as exploited in the wild. An attacker who gets a malicious page or message to run can break out of the browser sandbox and run code on the user's machine.","severity":"critical","cvss":10.0,"epss":0.55874,"exploited":true,"exploited_at":"2022-05-23T00:00:00+00:00","products":[{"name":"Mozilla Firefox and Thunderbird","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["desktop","exploited","firefox","linux","macos","package","thunderbird","windows"],"not_affected_if":["unknown"],"how_to_check":"Check the installed Firefox or Thunderbird version under Help > About; the sources do not give the affected version range.","fix":"Update Firefox and Thunderbird to the latest release, as CISA's required action says: apply updates per vendor instructions.","status":"open","published_at":"2019-07-23T14:15:15+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:16:07+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-23T21:16:07Z","model":"claude-haiku-5-5","output":{"fix":"Update Firefox and Thunderbird to the latest release, as CISA's required action says: apply updates per vendor instructions.","reach":"internet","impact":"high","summary":"Mozilla Firefox and Thunderbird contain a sandbox escape flaw that is listed as exploited in the wild. An attacker who gets a malicious page or message to run can break out of the browser sandbox and run code on the user's machine.","category":"package","who_cares":["firefox","thunderbird","desktop","windows","macos","linux"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker escapes browser sandbox and runs code on the user's machine.","analyst_note":"Sources do not list affected or fixed versions; check Mozilla's security advisory for CVE-2019-11708 for the fixed release numbers.","how_to_check":"Check the installed Firefox or Thunderbird version under Help > About; the sources do not give the affected version range.","needs_analyst":true,"not_affected_if":["unknown"],"user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000477,"input_tokens":2842,"output_tokens":385,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-11708':14A,17A '-2019':13A,16A '60.7.2':129C,134C '67.0.4':131C 'addit':110C 'affect':126C 'and':20A 'arbitrari':117C 'attack':48B 'break':59B 'browser':63B 'child':85C,105C 'chosen':101C 'code':67B,118C 'combin':108C 'compromis':104C 'comput':123C 'contain':34B 'content':100C 'could':113C 'cve':12A,15A 'desktop':22B 'escap':10A,37B 'esr':128C 'execut':116C 'exploit':23B,43B 'firefox':2A,6A,19A,24B,31B,127C,130C 'flaw':38B 'get':50B 'insuffici':73C 'ipc':82C 'linux':25B 'list':41B 'machin':72B 'maco':26B 'malici':52B 'messag':55B,83C 'mozilla':1A,5A,18A,30B 'non':94C 'non-sandbox':93C 'open':81C,98C 'packag':27B 'page':53B 'paramet':76C 'parent':87C,96C 'pass':77C 'process':88C,97C,106C 'prompt':80C 'result':90C,114C 'run':57B,66B 'sandbox':9A,36B,64B,95C 'thunderbird':4A,8A,21A,28B,33B,133C 'user':70B,121C 'vet':74C 'vulner':11A,111C,125C 'web':99C 'wild':46B 'window':29B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2019-07-23T14:15:15+00:00","kev":{"dateAdded":"2022-05-23","dueDate":"2022-06-13","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2019-11708","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2019-11708","severity":null,"published_at":"2022-05-23T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T10:39:06+00:00","note":null},{"source":"epss","external_id":"CVE-2019-11708","url":"https://api.first.org/data/v1/epss?cve=CVE-2019-11708","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:45+00:00","fetched_at":"2026-10-23T19:13:45+00:00","note":null},{"source":"nvd","external_id":"CVE-2019-11708","url":"https://nvd.nist.gov/vuln/detail/CVE-2019-11708","severity":null,"published_at":"2019-07-23T14:15:15+00:00","modified_at":"2026-06-17T02:13:28+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}