{"id":"CVE-2026-121171","kind":"vulnerability","aliases":["CVE-2026-121171"],"related":[],"title":"Chrome: DevTools confused deputy lets a crafted page bypass origin policy","description":"Confused deputy in DevTools in Google Chrome prior to 157.0.8103.38 allowed a remote attacker leveraging social engineering to bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)","summary":"Google Chrome versions before 157.0.8103.38 have a confused deputy flaw in DevTools. A remote attacker who tricks a user into opening a crafted HTML page can bypass web origin policy.","severity":"medium","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","chrome","desktop","runtime"],"not_affected_if":["chrome-125-or-later-fixed"],"how_to_check":"- Open Chrome and check the version under Help > About Google Chrome, or run `chrome://version` in the address bar.\n- Confirm the installed version is `157.0.8103.38` or later.","fix":"- Google Chrome: move to `157.0.8103.38` or later.","status":"open","published_at":"2026-11-03T21:17:25+00:00","first_seen_at":"2026-11-03T21:19:24+00:00","triaged_at":"2026-11-03T21:23:17+00:00","updated_at":"2026-11-03T21:23:17+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-11-03T21:23:17Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.38` or later.","reach":"internet","title":"Chrome: DevTools confused deputy lets a crafted page bypass origin policy","impact":"medium","summary":"Google Chrome versions before 157.0.8103.38 have a confused deputy flaw in DevTools. A remote attacker who tricks a user into opening a crafted HTML page can bypass web origin policy.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browser","desktop"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"A crafted page bypasses origin policy and reads data from other sites.","analyst_note":"","how_to_check":"- Open Chrome and check the version under Help > About Google Chrome, or run `chrome://version` in the address bar.\n- Confirm the installed version is `157.0.8103.38` or later.","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-125-or-later-fixed"],"who_is_affected":"Anyone running Google Chrome before 157.0.8103.38 is exposed, since the flaw is in the browser's DevTools component. Exploitation requires social engineering to get the user to visit a crafted HTML page. Systems on managed or auto-updating Chrome that already run the fixed version can skip it.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000687,"input_tokens":4106,"output_tokens":552,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121171':14A,17A '-2026':13A,16A '157.0.8103.38':26B,61C 'allow':62C 'attack':36B,65C 'browser':18B 'bypass':9A,48B,70C 'chrome':1A,19B,23B,58C 'chromium':79C 'confus':3A,29B,52C 'craft':7A,44B,76C 'cve':12A,15A 'deputi':4A,30B,53C 'desktop':20B 'devtool':2A,33B,55C 'engin':68C 'flaw':31B 'googl':22B,57C 'html':45B,77C 'let':5A 'leverag':66C 'medium':82C 'open':42B 'origin':10A,50B,72C 'page':8A,46B,78C 'polici':11A,51B,73C 'prior':59C 'remot':35B,64C 'runtim':21B 'secur':80C 'sever':81C 'social':67C 'trick':38B 'user':40B 'version':24B 'via':74C 'web':49B,71C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome before 157.0.8103.38 is exposed, since the flaw is in the browser's DevTools component. Exploitation requires social engineering to get the user to visit a crafted HTML page. Systems on managed or auto-updating Chrome that already run the fixed version 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":["browser","chrome","desktop","medium","runtime"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:25+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121171","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121171","severity":null,"published_at":"2026-11-03T21:17:25+00:00","modified_at":"2026-11-03T21:17:25+00:00","first_seen_at":"2026-11-03T21:19:24+00:00","fetched_at":"2026-11-03T21:19:24+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"}