{"id":"CVE-2026-121142","kind":"vulnerability","aliases":["CVE-2026-121142"],"related":[],"title":"Chrome: network authorization flaw lets a crafted extension bypass web origin policy","description":"Incorrect authorization in Network in Google Chrome prior to 157.0.8103.38 allowed a remote attacker leveraging social engineering to bypass web origin policy via a crafted Chrome extension. (Chromium security severity: Low)","summary":"Google Chrome before 157.0.8103.38 has an incorrect authorization check in its Network component. A remote attacker who tricks a user into installing a crafted Chrome extension can bypass web origin policy.","severity":"low","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","chrome","linux","macos","package","windows"],"not_affected_if":["chrome-up-to-date","no-extensions-installed"],"how_to_check":"- Check the installed Chrome version at chrome://settings/help and compare it with `157.0.8103.38`.\n- Review installed extensions at chrome://extensions for anything unexpected.","fix":"- Google Chrome: move to `157.0.8103.38` or later.","status":"open","published_at":"2026-11-03T21:17:22+00:00","first_seen_at":"2026-11-03T21:19:22+00:00","triaged_at":"2026-11-03T21:24:39+00:00","updated_at":"2026-11-03T21:24:39+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-03T21:24:39Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.38` or later.","reach":"internet","title":"Chrome: network authorization flaw lets a crafted extension bypass web origin policy","impact":"medium","summary":"Google Chrome before 157.0.8103.38 has an incorrect authorization check in its Network component. A remote attacker who tricks a user into installing a crafted Chrome extension can bypass web origin policy.","audience":"everyone","category":"package","nicknames":[],"who_cares":["chrome","browser","windows","macos","linux"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Attacker bypasses web origin policy, reading or acting on other sites' data","analyst_note":"","how_to_check":"- Check the installed Chrome version at chrome://settings/help and compare it with `157.0.8103.38`.\n- Review installed extensions at chrome://extensions for anything unexpected.","plain_action":"Update Google Chrome to version 157.0.8103.38 or later and remove any extensions you did not install on purpose.","needs_analyst":false,"not_affected_if":["chrome-up-to-date","no-extensions-installed"],"who_is_affected":"Any desktop user running Google Chrome older than 157.0.8103.38 is potentially exposed, and the attack requires a user to be socially engineered into installing a malicious extension. Managed fleets running Chrome should confirm their version. Users on current Chrome builds can skip it.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"low"},"cost_usd":0.000685,"input_tokens":4106,"output_tokens":549,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121142':15A,18A '-2026':14A,17A '157.0.8103.38':28B,65C 'allow':66C 'attack':40B,69C 'author':3A,32B,57C 'browser':19B 'bypass':9A,52B,74C 'check':33B 'chrome':1A,20B,26B,49B,62C,81C 'chromium':83C 'compon':37B 'craft':7A,48B,80C 'cve':13A,16A 'engin':72C 'extens':8A,50B,82C 'flaw':4A 'googl':25B,61C 'incorrect':31B,56C 'instal':46B 'let':5A 'leverag':70C 'linux':21B 'low':86C 'maco':22B 'network':2A,36B,59C 'origin':11A,54B,76C 'packag':23B 'polici':12A,55B,77C 'prior':63C 'remot':39B,68C 'secur':84C 'sever':85C 'social':71C 'trick':42B 'user':44B 'via':78C 'web':10A,53B,75C 'window':24B","nicknames":[],"mitigations":[],"who_affected":"Any desktop user running Google Chrome older than 157.0.8103.38 is potentially exposed, and the attack requires a user to be socially engineered into installing a malicious extension. Managed fleets running Chrome should confirm their version. Users on current Chrome builds can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Google Chrome to version 157.0.8103.38 or later and remove any extensions you did not install on purpose.","pkeys":[],"ptokens":[],"labels":["browser","chrome","linux","low","macos","package","windows"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:22+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121142","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121142","severity":null,"published_at":"2026-11-03T21:17:22+00:00","modified_at":"2026-11-03T21:17:22+00:00","first_seen_at":"2026-11-03T21:19:22+00:00","fetched_at":"2026-11-03T21:19:22+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"}