{"id":"CVE-2026-126873","kind":"vulnerability","aliases":["CVE-2026-126873"],"related":[],"title":"Chrome on Windows: extension use-after-free lets a crafted page run code","description":"Use after free in Extensions in Google Chrome on on Windows prior to 157.0.8103.78 allowed a remote attacker leveraging social engineering to execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)","summary":"A use-after-free bug in Chrome's Extensions component on Windows lets an attacker who tricks a user into visiting a crafted HTML page run arbitrary code outside the browser sandbox. Chromium rates it High severity.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","chrome","other","windows"],"not_affected_if":["chrome-updated","non-windows"],"how_to_check":"- Open Chrome and check the version under Settings > About Chrome, or run `chrome://version` in the address bar.\n- Confirm the version is at least `157.0.8103.78` on Windows.","fix":"- Google Chrome on Windows: update to `157.0.8103.78` or later.","status":"open","published_at":"2026-11-11T23:17:16+00:00","first_seen_at":"2026-11-11T23:29:37+00:00","triaged_at":"2026-11-11T23:32:19+00:00","updated_at":"2026-11-11T23:32:19+00:00","category":"other","confidence":0.8,"triage":{"at":"2026-11-11T23:32:19Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome on Windows: update to `157.0.8103.78` or later.","reach":"internet","title":"Chrome on Windows: extension use-after-free lets a crafted page run code","impact":"high","summary":"A use-after-free bug in Chrome's Extensions component on Windows lets an attacker who tricks a user into visiting a crafted HTML page run arbitrary code outside the browser sandbox. Chromium rates it High severity.","audience":"everyone","category":"other","nicknames":[],"who_cares":["chrome","windows","browser"],"confidence":0.8,"fix_status":"available","needs_auth":"no","worst_case":"attacker runs arbitrary code outside the browser sandbox","analyst_note":"","how_to_check":"- Open Chrome and check the version under Settings > About Chrome, or run `chrome://version` in the address bar.\n- Confirm the version is at least `157.0.8103.78` on Windows.","plain_action":"Update Google Chrome on your Windows computer to version 157.0.8103.78 or later: open Chrome, go to Settings > About Chrome, and let it update.","product_name":"","needs_analyst":false,"not_affected_if":["chrome-updated","non-windows"],"who_is_affected":"Any Windows machine running Google Chrome before 157.0.8103.78 is exposed when a user opens a crafted HTML page. Exploitation needs social engineering to get the user to that page, and the sources do not describe any server-side exposure. Chrome on macOS, Linux and mobile is not named in the sources.","user_interaction":"yes","product_ecosystem":"","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000745,"input_tokens":4540,"output_tokens":582,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-126873':17A,20A '-2026':16A,19A '157.0.8103.78':76C 'allow':77C 'arbitrari':52B,86C 'attack':40B,80C 'browser':21B,56B 'bug':30B 'chrome':1A,22B,32B,70C 'chromium':58B,96C 'code':14A,53B,87C 'compon':35B 'craft':11A,48B,93C 'cve':15A,18A 'engin':83C 'execut':85C 'extens':4A,34B,67C 'free':8A,29B,65C 'googl':69C 'high':61B,99C 'html':49B,94C 'let':9A,38B 'leverag':81C 'outsid':54B,88C 'page':12A,50B,95C 'prior':74C 'rate':59B 'remot':79C 'run':13A,51B 'sandbox':57B,90C 'secur':97C 'sever':62B,98C 'social':82C 'trick':42B 'use':6A,27B,63C 'use-after-fre':5A,26B 'user':44B 'via':91C 'visit':46B 'window':3A,24B,37B,73C","nicknames":[],"mitigations":[],"who_affected":"Any Windows machine running Google Chrome before 157.0.8103.78 is exposed when a user opens a crafted HTML page. Exploitation needs social engineering to get the user to that page, and the sources do not describe any server-side exposure. Chrome on macOS, Linux and mobile is not named in the sources.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Google Chrome on your Windows computer to version 157.0.8103.78 or later: open Chrome, go to Settings > About Chrome, and let it update.","pkeys":[],"ptokens":[],"labels":["browser","chrome","high","other","windows"],"campaign_type":null,"search_a":"'-126873':17A,20A '-2026':16A,19A 'chrome':1A 'code':14A 'craft':11A 'cve':15A,18A 'extens':4A 'free':8A 'let':9A 'page':12A 'run':13A 'use':6A 'use-after-fre':5A 'window':3A","search_b":"'arbitrari':52B 'attack':40B 'browser':21B,56B 'bug':30B 'chrome':22B,32B 'chromium':58B 'code':53B 'compon':35B 'craft':48B 'extens':34B 'free':29B 'high':61B 'html':49B 'let':38B 'outsid':54B 'page':50B 'rate':59B 'run':51B 'sandbox':57B 'sever':62B 'trick':42B 'use':27B 'use-after-fre':26B 'user':44B 'visit':46B 'window':24B,37B","search_c":"'157.0.8103.78':76C 'allow':77C 'arbitrari':86C 'attack':80C 'chrome':70C 'chromium':96C 'code':87C 'craft':93C 'engin':83C 'execut':85C 'extens':67C 'free':65C 'googl':69C 'high':99C 'html':94C 'leverag':81C 'outsid':88C 'page':95C 'prior':74C 'remot':79C 'sandbox':90C 'secur':97C 'sever':98C 'social':82C 'use':63C 'via':91C 'window':73C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-11T23:17:16+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-126873","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126873","severity":null,"published_at":"2026-11-11T23:17:16+00:00","modified_at":"2026-11-11T23:17:16+00:00","first_seen_at":"2026-11-11T23:29:37+00:00","fetched_at":"2026-11-11T23:29:37+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}