{"id":"CVE-2026-126866","kind":"vulnerability","aliases":["CVE-2026-126866"],"related":[],"title":"Chrome: extension authorization flaw lets a crafted extension run code in sandbox","description":"Incorrect authorization in Extensions in Google Chrome prior to 157.0.8103.78 allowed a remote attacker leveraging social engineering to execute arbitrary code inside the sandbox via a crafted Chrome extension. (Chromium security severity: High)","summary":"Google Chrome versions before 157.0.8103.78 have an incorrect authorization flaw in extensions. A remote attacker who tricks a user into installing a crafted Chrome extension can execute arbitrary code inside the browser sandbox.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser-extensions","chrome","linux","macos","other","windows"],"not_affected_if":["chrome-updated","extensions-restricted"],"how_to_check":"- Check the Chrome version in the browser's About page or with `chrome://version`; versions below `157.0.8103.78` are affected.","fix":"- Google Chrome: `157.0.8103.78`","status":"open","published_at":"2026-11-11T23:17:15+00:00","first_seen_at":"2026-11-11T23:29:37+00:00","triaged_at":"2026-11-11T23:33:21+00:00","updated_at":"2026-11-11T23:33:21+00:00","category":"other","confidence":0.7,"triage":{"at":"2026-11-11T23:33:21Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: `157.0.8103.78`","reach":"internet","title":"Chrome: extension authorization flaw lets a crafted extension run code in sandbox","impact":"medium","summary":"Google Chrome versions before 157.0.8103.78 have an incorrect authorization flaw in extensions. A remote attacker who tricks a user into installing a crafted Chrome extension can execute arbitrary code inside the browser sandbox.","audience":"everyone","category":"other","nicknames":[],"who_cares":["chrome","browser-extensions","windows","macos","linux"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Code runs inside the browser sandbox via a crafted extension","analyst_note":"","how_to_check":"- Check the Chrome version in the browser's About page or with `chrome://version`; versions below `157.0.8103.78` are affected.\n- unknown","plain_action":"Update Google Chrome to version 157.0.8103.78 or later, and only install extensions you trust.","product_name":"","needs_analyst":false,"not_affected_if":["chrome-updated","extensions-restricted"],"who_is_affected":"Anyone running Google Chrome older than 157.0.8103.78 is exposed, and the attack needs a user to install a crafted extension. Managed fleets that pin Chrome versions or restrict extension installs are less exposed.","user_interaction":"yes","product_ecosystem":"","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.00072,"input_tokens":4544,"output_tokens":532,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-126866':15A,18A '-2026':14A,17A '157.0.8103.78':31B,69C 'allow':70C 'arbitrari':54B,79C 'attack':41B,73C 'author':3A,35B,61C 'browser':20B,58B 'browser-extens':19B 'chrome':1A,22B,28B,50B,66C,87C 'chromium':89C 'code':10A,55B,80C 'craft':7A,49B,86C 'cve':13A,16A 'engin':76C 'execut':53B,78C 'extens':2A,8A,21B,38B,51B,63C,88C 'flaw':4A,36B 'googl':27B,65C 'high':92C 'incorrect':34B,60C 'insid':56B,81C 'instal':47B 'let':5A 'leverag':74C 'linux':23B 'maco':24B 'prior':67C 'remot':40B,72C 'run':9A 'sandbox':12A,59B,83C 'secur':90C 'sever':91C 'social':75C 'trick':43B 'user':45B 'version':29B 'via':84C 'window':26B","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome older than 157.0.8103.78 is exposed, and the attack needs a user to install a crafted extension. Managed fleets that pin Chrome versions or restrict extension installs are less exposed.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Google Chrome to version 157.0.8103.78 or later, and only install extensions you trust.","pkeys":[],"ptokens":[],"labels":["browserextensions","chrome","high","linux","macos","other","windows"],"campaign_type":null,"search_a":"'-126866':15A,18A '-2026':14A,17A 'author':3A 'chrome':1A 'code':10A 'craft':7A 'cve':13A,16A 'extens':2A,8A 'flaw':4A 'let':5A 'run':9A 'sandbox':12A","search_b":"'157.0.8103.78':31B 'arbitrari':54B 'attack':41B 'author':35B 'browser':20B,58B 'browser-extens':19B 'chrome':22B,28B,50B 'code':55B 'craft':49B 'execut':53B 'extens':21B,38B,51B 'flaw':36B 'googl':27B 'incorrect':34B 'insid':56B 'instal':47B 'linux':23B 'maco':24B 'remot':40B 'sandbox':59B 'trick':43B 'user':45B 'version':29B 'window':26B","search_c":"'157.0.8103.78':69C 'allow':70C 'arbitrari':79C 'attack':73C 'author':61C 'chrome':66C,87C 'chromium':89C 'code':80C 'craft':86C 'engin':76C 'execut':78C 'extens':63C,88C 'googl':65C 'high':92C 'incorrect':60C 'insid':81C 'leverag':74C 'prior':67C 'remot':72C 'sandbox':83C 'secur':90C 'sever':91C 'social':75C 'via':84C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-11T23:17:15+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-126866","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126866","severity":null,"published_at":"2026-11-11T23:17:15+00:00","modified_at":"2026-11-11T23:17:15+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"}