{"id":"CVE-2026-121204","kind":"vulnerability","aliases":["CVE-2026-121204"],"related":[],"title":"Chrome: incomplete DevTools cleanup lets a web page bypass origin policy","description":"Incomplete cleanup in DevTools in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: Low)","summary":"Google Chrome before 157.0.8103.38 has an incomplete cleanup flaw in DevTools. A remote attacker can use a crafted HTML page to bypass web origin policy, per the Chromium security severity rating of Low.","severity":"low","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","desktop","runtime"],"not_affected_if":["already-updated"],"how_to_check":"- Check the Chrome version under Chrome menu > Help > About Google Chrome, or run `google-chrome --version` on Linux.\n- Compare the installed version against `157.0.8103.38`.","fix":"- Google Chrome: move to `157.0.8103.38` or later.","status":"open","published_at":"2026-11-03T21:17:29+00:00","first_seen_at":"2026-11-03T21:19:26+00:00","triaged_at":"2026-11-03T21:22:45+00:00","updated_at":"2026-11-03T21:22:45+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-11-03T21:22:45Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.38` or later.","reach":"internet","title":"Chrome: incomplete DevTools cleanup lets a web page bypass origin policy","impact":"medium","summary":"Google Chrome before 157.0.8103.38 has an incomplete cleanup flaw in DevTools. A remote attacker can use a crafted HTML page to bypass web origin policy, per the Chromium security severity rating of Low.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browsers","desktop"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"A crafted web page bypasses origin policy and reads cross-site data","analyst_note":"","how_to_check":"- Check the Chrome version under Chrome menu > Help > About Google Chrome, or run `google-chrome --version` on Linux.\n- Compare the installed version against `157.0.8103.38`.","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":["already-updated"],"who_is_affected":"Anyone running Google Chrome before 157.0.8103.38 who browses untrusted web pages is exposed, since the attack is triggered by a crafted HTML page. Managed fleets and servers that run Chrome only for headless automation should check their versions too. Users who have already updated are not affected.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"low"},"cost_usd":0.000686,"input_tokens":4103,"output_tokens":551,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121204':14A,17A '-2026':13A,16A '157.0.8103.38':25B,64C 'allow':65C 'attack':35B,68C 'browser':18B 'bypass':9A,43B,70C 'chrome':1A,19B,23B,61C 'chromium':49B,79C 'cleanup':4A,29B,56C 'craft':39B,76C 'cve':12A,15A 'desktop':20B 'devtool':3A,32B,58C 'flaw':30B 'googl':22B,60C 'html':40B,77C 'incomplet':2A,28B,55C 'let':5A 'low':54B,82C 'origin':10A,45B,72C 'page':8A,41B,78C 'per':47B 'polici':11A,46B,73C 'prior':62C 'rate':52B 'remot':34B,67C 'runtim':21B 'secur':50B,80C 'sever':51B,81C 'use':37B 'via':74C 'web':7A,44B,71C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome before 157.0.8103.38 who browses untrusted web pages is exposed, since the attack is triggered by a crafted HTML page. Managed fleets and servers that run Chrome only for headless automation should check their versions too. Users who have already updated are not affected.","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":["browsers","chrome","desktop","low","runtime"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:29+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121204","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121204","severity":null,"published_at":"2026-11-03T21:17:29+00:00","modified_at":"2026-11-03T21:17:29+00:00","first_seen_at":"2026-11-03T21:19:26+00:00","fetched_at":"2026-11-03T21:19:26+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"}