{"id":"CVE-2026-121220","kind":"vulnerability","aliases":["CVE-2026-121220"],"related":[],"title":"Chrome: compromised renderer can bypass system access restrictions via crafted HTML","description":"Incorrect authorization in Core in Google Chrome prior to 157.0.8103.38 allowed a remote attacker who had compromised the renderer process to bypass system access restrictions via a crafted HTML page. (Chromium security severity: Medium)","summary":"Incorrect authorization in the Core component of Google Chrome before 157.0.8103.38 lets a remote attacker who has already compromised the renderer process bypass system access restrictions. The attack is triggered by a crafted HTML page.","severity":"medium","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","chrome","desktop","runtime"],"not_affected_if":["chrome-updated"],"how_to_check":"- Check the installed Chrome version at chrome://settings/help and compare it to `157.0.8103.38`.\n- Managed fleets: confirm the Chrome build version reported by the device management console.","fix":"- Google Chrome: move to `157.0.8103.38` or later.","status":"open","published_at":"2026-11-03T21:17:31+00:00","first_seen_at":"2026-11-03T21:19:27+00:00","triaged_at":"2026-11-03T21:21:29+00:00","updated_at":"2026-11-03T21:21:29+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-11-03T21:21:29Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.38` or later.","reach":"internet","title":"Chrome: compromised renderer can bypass system access restrictions via crafted HTML","impact":"medium","summary":"Incorrect authorization in the Core component of Google Chrome before 157.0.8103.38 lets a remote attacker who has already compromised the renderer process bypass system access restrictions. The attack is triggered by a crafted HTML page.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","desktop","browser"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Attacker escapes renderer sandbox restrictions and reaches system resources","analyst_note":"","how_to_check":"- Check the installed Chrome version at chrome://settings/help and compare it to `157.0.8103.38`.\n- Managed fleets: confirm the Chrome build version reported by the device management console.","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":"Any device running Google Chrome before 157.0.8103.38 is in scope. Exploitation requires a renderer compromise first, so the flaw is a second-stage escape rather than a standalone entry point. Systems running a current Chrome build can skip it.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000681,"input_tokens":4106,"output_tokens":540,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121220':14A,17A '-2026':13A,16A '157.0.8103.38':32B,66C 'access':7A,46B,80C 'allow':67C 'alreadi':39B 'attack':36B,49B,70C 'author':23B,58C 'browser':18B 'bypass':5A,44B,78C 'chrome':1A,19B,30B,63C 'chromium':87C 'compon':27B 'compromis':2A,40B,73C 'core':26B,60C 'craft':10A,54B,84C 'cve':12A,15A 'desktop':20B 'googl':29B,62C 'html':11A,55B,85C 'incorrect':22B,57C 'let':33B 'medium':90C 'page':56B,86C 'prior':64C 'process':43B,76C 'remot':35B,69C 'render':3A,42B,75C 'restrict':8A,47B,81C 'runtim':21B 'secur':88C 'sever':89C 'system':6A,45B,79C 'trigger':51B 'via':9A,82C","nicknames":[],"mitigations":[],"who_affected":"Any device running Google Chrome before 157.0.8103.38 is in scope. Exploitation requires a renderer compromise first, so the flaw is a second-stage escape rather than a standalone entry point. Systems running a current Chrome build can skip it.","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":["browser","chrome","desktop","medium","runtime"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:31+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121220","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121220","severity":null,"published_at":"2026-11-03T21:17:31+00:00","modified_at":"2026-11-03T21:17:31+00:00","first_seen_at":"2026-11-03T21:19:27+00:00","fetched_at":"2026-11-03T21:19:27+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"}