{"id":"CVE-2026-121135","kind":"vulnerability","aliases":["CVE-2026-121135"],"related":[],"title":"Chrome: crafted web page bypasses web origin policy before 157.0.8103.38","description":"Security issue in Platform in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)","summary":"A flaw in Google Chrome's Platform component lets a remote attacker bypass web origin policy using a crafted HTML page. Chromium rates it Medium severity, and an attacker could read or act on data across sites a visitor has open.","severity":"medium","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","endpoints","runtime"],"not_affected_if":["current-chrome-version"],"how_to_check":"- Open Chrome and check the version under Help > About Google Chrome, or run `google-chrome --version` on Linux.\n- Confirm the installed version is at or above `157.0.8103.38`.","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":"2026-11-03T21:24:43+00:00","updated_at":"2026-11-03T21:24:43+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-11-03T21:24:43Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.38` or later.","reach":"internet","title":"Chrome: crafted web page bypasses web origin policy before 157.0.8103.38","impact":"medium","summary":"A flaw in Google Chrome's Platform component lets a remote attacker bypass web origin policy using a crafted HTML page. Chromium rates it Medium severity, and an attacker could read or act on data across sites a visitor has open.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browsers","endpoints"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Attacker reads or alters data from other origins in the browser","analyst_note":"","how_to_check":"- Open Chrome and check the version under Help > About Google Chrome, or run `google-chrome --version` on Linux.\n- Confirm the installed version is at or above `157.0.8103.38`.","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":["current-chrome-version"],"who_is_affected":"Anyone browsing with Google Chrome builds before 157.0.8103.38 is exposed when they visit a malicious page. Managed fleets and kiosks running older Chrome builds are the main concern for businesses. Teams on current Chrome builds can skip it.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.00068,"input_tokens":4094,"output_tokens":541,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121135':13A,16A '-2026':12A,15A '157.0.8103.38':10A,71C 'across':56B 'act':53B 'allow':72C 'attack':32B,49B,75C 'browser':17B 'bypass':5A,33B,77C 'chrome':1A,18B,25B,68C 'chromium':42B,86C 'compon':28B 'could':50B 'craft':2A,39B,83C 'cve':11A,14A 'data':55B 'endpoint':19B 'flaw':22B 'googl':24B,67C 'html':40B,84C 'issu':63C 'let':29B 'medium':45B,89C 'open':61B 'origin':7A,35B,79C 'page':4A,41B,85C 'platform':27B,65C 'polici':8A,36B,80C 'prior':69C 'rate':43B 'read':51B 'remot':31B,74C 'runtim':20B 'secur':62C,87C 'sever':46B,88C 'site':57B 'use':37B 'via':81C 'visitor':59B 'web':3A,6A,34B,78C","nicknames":[],"mitigations":[],"who_affected":"Anyone browsing with Google Chrome builds before 157.0.8103.38 is exposed when they visit a malicious page. Managed fleets and kiosks running older Chrome builds are the main concern for businesses. Teams 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: Chrome menu > Help > About Google Chrome.","pkeys":[],"ptokens":[],"labels":["browsers","chrome","endpoints","medium","runtime"],"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-2026-121135","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121135","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"}