{"id":"CVE-2026-121244","kind":"vulnerability","aliases":["CVE-2026-121244"],"related":[],"title":"Chrome: FileAPI UI spoofing lets a crafted page fake browser prompts","description":"UI misrepresentation in FileAPI in Google Chrome prior to 157.0.8103.38 allowed a remote attacker leveraging social engineering to spoof UI elements via a crafted HTML page. (Chromium security severity: Medium)","summary":"A flaw in the FileAPI component of Google Chrome lets a crafted HTML page spoof user interface elements. A remote attacker who tricks a user into visiting the page can make fake UI appear, which supports social engineering.","severity":"medium","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","endpoints","runtime"],"not_affected_if":["chrome-updated","non-chrome-browsers"],"how_to_check":"- Check the installed Chrome version at 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":"2026-11-03T21:17:34+00:00","first_seen_at":"2026-11-03T21:19:29+00:00","triaged_at":"2026-11-03T21:21:05+00:00","updated_at":"2026-11-03T21:21:05+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-11-03T21:21:05Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.38` or later","reach":"internet","title":"Chrome: FileAPI UI spoofing lets a crafted page fake browser prompts","impact":"low","summary":"A flaw in the FileAPI component of Google Chrome lets a crafted HTML page spoof user interface elements. A remote attacker who tricks a user into visiting the page can make fake UI appear, which supports social engineering.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browsers","endpoints"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"User is tricked by spoofed interface elements into harmful actions","analyst_note":"","how_to_check":"- Check the installed Chrome version at chrome://settings/help and compare it to `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":["chrome-updated","non-chrome-browsers"],"who_is_affected":"Anyone running Google Chrome before 157.0.8103.38 who browses untrusted pages is exposed, since the attack needs a user to open a crafted HTML page. Managed fleets that pin Chrome versions should check their build; users who keep Chrome auto-updated are likely already covered.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000675,"input_tokens":4111,"output_tokens":527,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121244':14A,17A '-2026':13A,16A '157.0.8103.38':69C 'allow':70C 'appear':55B 'attack':42B,73C 'browser':10A,18B 'chrome':1A,19B,30B,66C 'chromium':86C 'compon':27B 'craft':7A,33B,83C 'cve':12A,15A 'element':39B,80C 'endpoint':20B 'engin':59B,76C 'fake':9A,53B 'fileapi':2A,26B,63C 'flaw':23B 'googl':29B,65C 'html':34B,84C 'interfac':38B 'let':5A,31B 'leverag':74C 'make':52B 'medium':89C 'misrepresent':61C 'page':8A,35B,50B,85C 'prior':67C 'prompt':11A 'remot':41B,72C 'runtim':21B 'secur':87C 'sever':88C 'social':58B,75C 'spoof':4A,36B,78C 'support':57B 'trick':44B 'ui':3A,54B,60C,79C 'user':37B,46B 'via':81C 'visit':48B","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome before 157.0.8103.38 who browses untrusted pages is exposed, since the attack needs a user to open a crafted HTML page. Managed fleets that pin Chrome versions should check their build; users who keep Chrome auto-updated are likely already covered.","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-2026-121244","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121244","severity":null,"published_at":"2026-11-03T21:17:34+00:00","modified_at":"2026-11-03T21:17:34+00:00","first_seen_at":"2026-11-03T21:19:29+00:00","fetched_at":"2026-11-03T21:19:29+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"}