{"id":"CVE-2026-124853","kind":"vulnerability","aliases":["CVE-2026-124853"],"related":[],"title":"Firefox: boundary error in Graphics Text lets content escape sandbox","description":"Sandbox escape due to incorrect boundary conditions in the Graphics: Text component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.","summary":"A flaw in Firefox's Graphics: Text component lets content break out of the browser's sandbox. The sources do not say what an attacker gets beyond that escape.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","desktop","firefox","other"],"not_affected_if":["already-updated"],"how_to_check":"- Check the installed Firefox version in the browser's About page or with `firefox --version`\n- Compare against fixed versions `160`, `115.45` (ESR) and `153.7` (ESR)","fix":"- Firefox: `160`\n- Firefox ESR: `115.45` and `153.7`","status":"open","published_at":"2026-11-10T14:17:17+00:00","first_seen_at":"2026-11-10T14:22:13+00:00","triaged_at":"2026-11-10T14:26:44+00:00","updated_at":"2026-11-10T14:26:44+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-11-10T14:26:44Z","model":"claude-haiku-5-5","output":{"fix":"- Firefox: `160`\n- Firefox ESR: `115.45` and `153.7`","reach":"internet","title":"Firefox: boundary error in Graphics Text lets content escape sandbox","impact":"high","summary":"A flaw in Firefox's Graphics: Text component lets content break out of the browser's sandbox. The sources do not say what an attacker gets beyond that escape.","audience":"everyone","category":"other","nicknames":[],"who_cares":["firefox","desktop","browser"],"confidence":0.6,"fix_status":"available","needs_auth":"unknown","worst_case":"Web content escapes the browser sandbox to reach the system","analyst_note":"Confirm the attack trigger and exploitability from the Mozilla advisory for CVE-2026-124853; the NVD entry gives no details.","how_to_check":"- Check the installed Firefox version in the browser's About page or with `firefox --version`\n- Compare against fixed versions `160`, `115.45` (ESR) and `153.7` (ESR)","plain_action":"Update Firefox to version 160, or the ESR version 115.45 or 153.7 if you use ESR: open the menu and choose Help > About Firefox.","product_name":"","needs_analyst":true,"not_affected_if":["already-updated"],"who_is_affected":"Anyone running Firefox or Firefox ESR older than the fixed versions is exposed, since the flaw is in the browser itself. Sources do not say whether a specific page or content type is needed to trigger it.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000728,"input_tokens":4510,"output_tokens":555,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124853':13A,16A '-2026':12A,15A '115.45':70C '153.7':74C '160':67C 'attack':44B 'beyond':46B 'boundari':2A,54C 'break':30B 'browser':17B,34B 'compon':27B,60C 'condit':55C 'content':8A,29B 'cve':11A,14A 'desktop':18B 'due':51C 'error':3A 'escap':9A,48B,50C 'esr':69C,73C 'firefox':1A,19B,23B,66C,68C,72C 'fix':64C 'flaw':21B 'get':45B 'graphic':5A,25B,58C 'incorrect':53C 'let':7A,28B 'sandbox':10A,36B,49C 'say':41B 'sourc':38B 'text':6A,26B,59C 'vulner':62C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Firefox or Firefox ESR older than the fixed versions is exposed, since the flaw is in the browser itself. Sources do not say whether a specific page or content type is needed to trigger it.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Firefox to version 160, or the ESR version 115.45 or 153.7 if you use ESR: open the menu and choose Help > About Firefox.","pkeys":[],"ptokens":[],"labels":["browser","desktop","firefox","high","other"],"campaign_type":null,"search_a":"'-124853':13A,16A '-2026':12A,15A 'boundari':2A 'content':8A 'cve':11A,14A 'error':3A 'escap':9A 'firefox':1A 'graphic':5A 'let':7A 'sandbox':10A 'text':6A","search_b":"'attack':44B 'beyond':46B 'break':30B 'browser':17B,34B 'compon':27B 'content':29B 'desktop':18B 'escap':48B 'firefox':19B,23B 'flaw':21B 'get':45B 'graphic':25B 'let':28B 'sandbox':36B 'say':41B 'sourc':38B 'text':26B","search_c":"'115.45':70C '153.7':74C '160':67C 'boundari':54C 'compon':60C 'condit':55C 'due':51C 'escap':50C 'esr':69C,73C 'firefox':66C,68C,72C 'fix':64C 'graphic':58C 'incorrect':53C 'sandbox':49C 'text':59C 'vulner':62C","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-2026-124853","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124853","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"}