{"id":"CVE-2026-121239","kind":"vulnerability","aliases":["CVE-2026-121239"],"related":[],"title":"Chrome: crafted web page leaks cross-origin data to remote attackers","description":"Information leak in Core in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to obtain cross-origin data via a crafted HTML page. (Chromium security severity: Medium)","summary":"A flaw in the Core component of Google Chrome lets a remote attacker obtain data from other websites through a crafted HTML page. The Chromium security severity is rated Medium.","severity":"medium","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","endpoints","runtime"],"not_affected_if":["chrome-updated"],"how_to_check":"- Open Chrome and check the version under Settings > About Chrome, or run `chrome --version` on the machine.\n- Compare the installed version against `157.0.8103.38`; anything older is in the stated range.","fix":"- Google Chrome: move to `157.0.8103.38` or later.","status":"open","published_at":"2026-11-03T21:17:34+00:00","first_seen_at":"2026-11-03T21:19:28+00:00","triaged_at":"2026-11-03T21:21:12+00:00","updated_at":"2026-11-03T21:21:12+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-11-03T21:21:12Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.38` or later.","reach":"internet","title":"Chrome: crafted web page leaks cross-origin data to remote attackers","impact":"medium","summary":"A flaw in the Core component of Google Chrome lets a remote attacker obtain data from other websites through a crafted HTML page. The Chromium security severity is rated Medium.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browsers","endpoints"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Attacker reads data from other websites visited in the browser","analyst_note":"","how_to_check":"- Open Chrome and check the version under Settings > About Chrome, or run `chrome --version` on the machine.\n- Compare the installed version against `157.0.8103.38`; anything older is in the stated range.","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":"Any device running Google Chrome before 157.0.8103.38 is in the stated range, and exposure comes from simply visiting a malicious page. Managed fleets should confirm the installed version on each machine. unknown for whether specific enterprise configurations change exposure.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000669,"input_tokens":4095,"output_tokens":518,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121239':15A,18A '-2026':14A,17A '157.0.8103.38':62C 'allow':63C 'attack':12A,35B,66C 'browser':19B 'chrome':1A,20B,31B,59C 'chromium':47B,78C 'compon':28B 'core':27B,56C 'craft':2A,43B,75C 'cross':7A,70C 'cross-origin':6A,69C 'cve':13A,16A 'data':9A,37B,72C 'endpoint':21B 'flaw':24B 'googl':30B,58C 'html':44B,76C 'inform':53C 'leak':5A,54C 'let':32B 'medium':52B,81C 'obtain':36B,68C 'origin':8A,71C 'page':4A,45B,77C 'prior':60C 'rate':51B 'remot':11A,34B,65C 'runtim':22B 'secur':48B,79C 'sever':49B,80C 'via':73C 'web':3A 'websit':40B","nicknames":[],"mitigations":[],"who_affected":"Any device running Google Chrome before 157.0.8103.38 is in the stated range, and exposure comes from simply visiting a malicious page. Managed fleets should confirm the installed version on each machine. unknown for whether specific enterprise configurations change exposure.","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: Chrome menu > Help > About Google Chrome.","pkeys":[],"ptokens":[],"labels":["browsers","chrome","endpoints","medium","runtime"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:34+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121239","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121239","severity":null,"published_at":"2026-11-03T21:17:34+00:00","modified_at":"2026-11-03T21:17:34+00:00","first_seen_at":"2026-11-03T21:19:28+00:00","fetched_at":"2026-11-03T21:19:28+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"}