{"id":"CVE-2026-121130","kind":"vulnerability","aliases":["CVE-2026-121130"],"related":[],"title":"Chrome: form observable discrepancy leaks sensitive data from crafted pages","description":"Observable discrepancy in Forms in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to obtain sensitive information via a crafted HTML page. (Chromium security severity: Low)","summary":"A flaw in how Google Chrome's Forms handle some inputs lets a remote attacker observe a difference in behavior and learn sensitive information. The attacker needs the victim to open a crafted HTML page; Chromium rates it Low severity.","severity":"low","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","end-users","package"],"not_affected_if":["chrome-updated"],"how_to_check":"- Check the installed Chrome version at chrome://settings/help or with `google-chrome --version`\n- Confirm the version is below `157.0.8103.38`","fix":"- Google Chrome: move to `157.0.8103.38` or later","status":"open","published_at":"2026-11-03T21:17:21+00:00","first_seen_at":"2026-11-03T21:19:21+00:00","triaged_at":"2026-11-03T21:24:48+00:00","updated_at":"2026-11-03T21:24:48+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-03T21:24:48Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.38` or later","reach":"internet","title":"Chrome: form observable discrepancy leaks sensitive data from crafted pages","impact":"low","summary":"A flaw in how Google Chrome's Forms handle some inputs lets a remote attacker observe a difference in behavior and learn sensitive information. The attacker needs the victim to open a crafted HTML page; Chromium rates it Low severity.","audience":"everyone","category":"package","nicknames":[],"who_cares":["chrome","browsers","end-users"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Sensitive information leaks to a site the user visits","analyst_note":"","how_to_check":"- Check the installed Chrome version at chrome://settings/help or with `google-chrome --version`\n- Confirm the version is below `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"],"who_is_affected":"Anyone running Google Chrome before 157.0.8103.38 who browses to untrusted pages is exposed. Managed fleets and Chromium-based browsers that share the same Forms code should be checked against their own patch levels.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"low"},"cost_usd":0.000664,"input_tokens":4098,"output_tokens":508,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121130':13A,16A '-2026':12A,15A '157.0.8103.38':72C 'allow':73C 'attack':37B,48B,76C 'behavior':42B 'browser':17B 'chrome':1A,18B,28B,69C 'chromium':58B,86C 'craft':9A,55B,83C 'cve':11A,14A 'data':7A 'differ':40B 'discrep':4A,64C 'end':20B 'end-us':19B 'flaw':24B 'form':2A,30B,66C 'googl':27B,68C 'handl':31B 'html':56B,84C 'inform':46B,80C 'input':33B 'leak':5A 'learn':44B 'let':34B 'low':61B,89C 'need':49B 'observ':3A,38B,63C 'obtain':78C 'open':53B 'packag':22B 'page':10A,57B,85C 'prior':70C 'rate':59B 'remot':36B,75C 'secur':87C 'sensit':6A,45B,79C 'sever':62B,88C 'user':21B 'via':81C 'victim':51B","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome before 157.0.8103.38 who browses to untrusted pages is exposed. Managed fleets and Chromium-based browsers that share the same Forms code should be checked against their own patch levels.","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","endusers","low","package"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:21+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121130","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121130","severity":null,"published_at":"2026-11-03T21:17:21+00:00","modified_at":"2026-11-03T21:17:21+00:00","first_seen_at":"2026-11-03T21:19:21+00:00","fetched_at":"2026-11-03T21:19:21+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"}