{"id":"CVE-2026-121104","kind":"vulnerability","aliases":["CVE-2026-121104"],"related":[],"title":"Chrome: FileSystem authorization flaw lets crafted page escape sandbox","description":"Incorrect authorization in FileSystem in Google Chrome prior to 157.0.8103.38 allowed a remote attacker leveraging social engineering to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)","summary":"Google Chrome versions before 157.0.8103.38 have an incorrect authorization flaw in the FileSystem component. A remote attacker who tricks a user into visiting a crafted HTML page could potentially execute code outside the browser sandbox.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","chrome","endpoints","runtime"],"not_affected_if":["chrome-updated"],"how_to_check":"- Check the installed Chrome version in the browser's About page (chrome://settings/help) and compare it to `157.0.8103.38`.","fix":"- Google Chrome: move to `157.0.8103.38` or later.","status":"open","published_at":"2026-11-03T21:17:16+00:00","first_seen_at":"2026-11-03T21:19:14+00:00","triaged_at":"2026-11-03T21:25:16+00:00","updated_at":"2026-11-03T21:25:16+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-11-03T21:25:16Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.38` or later.","reach":"internet","title":"Chrome: FileSystem authorization flaw lets crafted page escape sandbox","impact":"high","summary":"Google Chrome versions before 157.0.8103.38 have an incorrect authorization flaw in the FileSystem component. A remote attacker who tricks a user into visiting a crafted HTML page could potentially execute code outside the browser sandbox.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browser","endpoints"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Code runs outside the browser sandbox on the user's machine","analyst_note":"","how_to_check":"- Check the installed Chrome version in the browser's About page (chrome://settings/help) and compare it to `157.0.8103.38`.\n- unknown","plain_action":"Update Google Chrome to version 157.0.8103.38 or later: Chrome menu > Help > About Google Chrome.","needs_analyst":false,"not_affected_if":["chrome-updated"],"who_is_affected":"Anyone running Google Chrome before 157.0.8103.38 who opens untrusted web pages is potentially exposed, since the attack is delivered through a crafted HTML page and relies on social engineering. Managed fleets should confirm the Chrome build on every endpoint. Systems that do not run Chrome are not affected.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000685,"input_tokens":4119,"output_tokens":546,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121104':12A,15A '-2026':11A,14A '157.0.8103.38':24B,64C 'allow':65C 'arbitrari':75C 'attack':36B,68C 'author':3A,28B,56C 'browser':16B,53B 'chrome':1A,17B,21B,61C 'chromium':85C 'code':50B,76C 'compon':33B 'could':47B 'craft':6A,44B,82C 'cve':10A,13A 'endpoint':18B 'engin':71C 'escap':8A 'execut':49B,74C 'filesystem':2A,32B,58C 'flaw':4A,29B 'googl':20B,60C 'high':88C 'html':45B,83C 'incorrect':27B,55C 'let':5A 'leverag':69C 'outsid':51B,77C 'page':7A,46B,84C 'potenti':48B,73C 'prior':62C 'remot':35B,67C 'runtim':19B 'sandbox':9A,54B,79C 'secur':86C 'sever':87C 'social':70C 'trick':38B 'user':40B 'version':22B 'via':80C 'visit':42B","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome before 157.0.8103.38 who opens untrusted web pages is potentially exposed, since the attack is delivered through a crafted HTML page and relies on social engineering. Managed fleets should confirm the Chrome build on every endpoint. Systems that do not run Chrome are not affected.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Google Chrome to version 157.0.8103.38 or later: Chrome menu > Help > About Google Chrome.","pkeys":[],"ptokens":[],"labels":["browser","chrome","endpoints","high","runtime"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:16+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121104","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121104","severity":null,"published_at":"2026-11-03T21:17:16+00:00","modified_at":"2026-11-03T21:17:16+00:00","first_seen_at":"2026-11-03T21:19:14+00:00","fetched_at":"2026-11-03T21:19:14+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"}