{"id":"CVE-2026-121183","kind":"vulnerability","aliases":["CVE-2026-121183"],"related":[],"title":"Chrome: extension authorization flaw lets a compromised renderer escape the sandbox","description":"Incorrect authorization in Extensions in Google Chrome prior to 157.0.8103.38 allowed a remote attacker who had compromised the renderer process to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)","summary":"An incorrect authorization check in Chrome's Extensions component lets an attacker who already controls the renderer process run code outside the browser sandbox. The attacker needs a crafted HTML page to trigger it.","severity":"medium","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","chrome","desktop","runtime"],"not_affected_if":["chrome-at-or-above-157.0.8103.38"],"how_to_check":"- Check the installed Chrome version at chrome://settings/help and compare it with the fixed version below.","fix":"- Google Chrome: move to `157.0.8103.38` or later.","status":"open","published_at":"2026-11-03T21:17:26+00:00","first_seen_at":"2026-11-03T21:19:24+00:00","triaged_at":"2026-11-03T21:23:05+00:00","updated_at":"2026-11-03T21:23:05+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-11-03T21:23:05Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.38` or later.","reach":"internet","title":"Chrome: extension authorization flaw lets a compromised renderer escape the sandbox","impact":"high","summary":"An incorrect authorization check in Chrome's Extensions component lets an attacker who already controls the renderer process run code outside the browser sandbox. The attacker needs a crafted HTML page to trigger it.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browser","desktop"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Code runs outside the browser sandbox on the user's machine","analyst_note":"","how_to_check":"- Check the installed Chrome version at chrome://settings/help and compare it with the fixed version below.","plain_action":"Update Google Chrome to version 157.0.8103.38 or later by restarting the browser after it finishes updating.","needs_analyst":false,"not_affected_if":["chrome-at-or-above-157.0.8103.38"],"who_is_affected":"Anyone running Google Chrome before 157.0.8103.38 on desktop. The attack chains a renderer compromise with this flaw, so it is most relevant to users who browse untrusted pages. Managed fleets should confirm the version was pushed.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000661,"input_tokens":4119,"output_tokens":499,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121183':14A,17A '-2026':13A,16A '157.0.8103.38':64C 'allow':65C 'alreadi':35B 'arbitrari':78C 'attack':33B,47B,68C 'author':3A,24B,56C 'browser':18B,44B 'check':25B 'chrome':1A,19B,27B,61C 'chromium':88C 'code':41B,79C 'compon':30B 'compromis':7A,71C 'control':36B 'craft':50B,85C 'cve':12A,15A 'desktop':20B 'escap':9A 'execut':77C 'extens':2A,29B,58C 'flaw':4A 'googl':60C 'html':51B,86C 'incorrect':23B,55C 'let':5A,31B 'medium':91C 'need':48B 'outsid':42B,80C 'page':52B,87C 'potenti':76C 'prior':62C 'process':39B,74C 'remot':67C 'render':8A,38B,73C 'run':40B 'runtim':21B 'sandbox':11A,45B,82C 'secur':89C 'sever':90C 'trigger':54B 'via':83C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome before 157.0.8103.38 on desktop. The attack chains a renderer compromise with this flaw, so it is most relevant to users who browse untrusted pages. Managed fleets should confirm the version was pushed.","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 by restarting the browser after it finishes updating.","pkeys":[],"ptokens":[],"labels":["browser","chrome","desktop","medium","runtime"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:26+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121183","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121183","severity":null,"published_at":"2026-11-03T21:17:26+00:00","modified_at":"2026-11-03T21:17:27+00:00","first_seen_at":"2026-11-03T21:19:24+00:00","fetched_at":"2026-11-03T21:19:24+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"}