{"id":"CVE-2026-120930","kind":"vulnerability","aliases":["CVE-2026-120930"],"related":[],"title":"Google Chrome: incorrect authorization lets a crafted web page bypass origin policy","description":"Incorrect authorization in Blink in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: High)","summary":"Chrome's Blink rendering engine has an incorrect authorization flaw that lets a remote attacker bypass the web origin policy using a crafted HTML page. An attacker can read or act on data from other sites a visitor has open.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","desktop","mobile","runtime"],"not_affected_if":["chrome-156.0.8078.47-or-later"],"how_to_check":"- Check the installed Chrome version in Chrome's About page (chrome://settings/help) or with the browser's version output.\n- Compare it against the fixed version below.","fix":"- Google Chrome: move to `156.0.8078.47` or later.","status":"open","published_at":"2026-11-03T22:19:31+00:00","first_seen_at":"2026-11-03T23:15:08+00:00","triaged_at":"2026-11-03T23:16:18+00:00","updated_at":"2026-11-03T23:16:18+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-11-03T23:16:18Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `156.0.8078.47` or later.","reach":"internet","title":"Google Chrome: incorrect authorization lets a crafted web page bypass origin policy","impact":"medium","summary":"Chrome's Blink rendering engine has an incorrect authorization flaw that lets a remote attacker bypass the web origin policy using a crafted HTML page. An attacker can read or act on data from other sites a visitor has open.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browsers","desktop","mobile"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Attacker reads or acts on data from other sites in the browser","analyst_note":"Confirm the full scope of the bypass and whether other Chromium browsers are affected; check the Chrome release notes linked from NVD.","how_to_check":"- Check the installed Chrome version in Chrome's About page (chrome://settings/help) or with the browser's version output.\n- Compare it against the fixed version below.","plain_action":"Update Google Chrome to version 156.0.8078.47 or later from the Chrome settings help page.","needs_analyst":true,"not_affected_if":["chrome-156.0.8078.47-or-later"],"who_is_affected":"Any desktop or mobile installation of Google Chrome older than 156.0.8078.47 is exposed when a user visits a malicious page. Exposure is through normal browsing, so there is no account or special setting needed. Chromium-based browsers that pull the same Blink code may also need their own update; the sources do not say which ones.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000706,"input_tokens":4098,"output_tokens":593,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-120930':15A,18A '-2026':14A,17A '156.0.8078.47':73C 'act':54B 'allow':74C 'attack':38B,50B,77C 'author':4A,32B,65C 'blink':26B,67C 'browser':19B 'bypass':10A,39B,79C 'chrome':2A,20B,24B,70C 'chromium':88C 'craft':7A,46B,85C 'cve':13A,16A 'data':56B 'desktop':21B 'engin':28B 'flaw':33B 'googl':1A,69C 'high':91C 'html':47B,86C 'incorrect':3A,31B,64C 'let':5A,35B 'mobil':22B 'open':63B 'origin':11A,42B,81C 'page':9A,48B,87C 'polici':12A,43B,82C 'prior':71C 'read':52B 'remot':37B,76C 'render':27B 'runtim':23B 'secur':89C 'sever':90C 'site':59B 'use':44B 'via':83C 'visitor':61B 'web':8A,41B,80C","nicknames":[],"mitigations":[],"who_affected":"Any desktop or mobile installation of Google Chrome older than 156.0.8078.47 is exposed when a user visits a malicious page. Exposure is through normal browsing, so there is no account or special setting needed. Chromium-based browsers that pull the same Blink code may also need their own update; the sources do not say which ones.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Google Chrome to version 156.0.8078.47 or later from the Chrome settings help page.","pkeys":[],"ptokens":[],"labels":["browsers","chrome","desktop","high","mobile","runtime"],"campaign_type":null,"first_public_at":"2026-11-03T22:19:31+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-120930","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-120930","severity":null,"published_at":"2026-11-03T22:19:31+00:00","modified_at":"2026-11-03T22:19:31+00:00","first_seen_at":"2026-11-03T23:15:08+00:00","fetched_at":"2026-11-03T23:15:08+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"}