{"id":"CVE-2026-121205","kind":"vulnerability","aliases":["CVE-2026-121205"],"related":[],"title":"Chrome: CORS authorization flaw lets a crafted page bypass origin policy","description":"Incorrect authorization in CORS in Google Chrome prior to 157.0.8103.38 allowed a remote attacker leveraging social engineering to bypass web origin policy via a crafted HTML page. (Chromium security severity: Low)","summary":"Google Chrome before 157.0.8103.38 has an incorrect authorization flaw in its CORS handling. A remote attacker who tricks a user into opening a crafted HTML page can bypass web origin policy.","severity":"low","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","desktop","runtime"],"not_affected_if":["chrome-updated"],"how_to_check":"- Open Chrome and check the version under Settings > About Chrome, or run `chrome --version` on the command line.\n- Confirm whether the version is below `157.0.8103.38`.","fix":"- Google Chrome: `157.0.8103.38`","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: `157.0.8103.38`","reach":"internet","title":"Chrome: CORS authorization flaw lets a crafted page bypass origin policy","impact":"medium","summary":"Google Chrome before 157.0.8103.38 has an incorrect authorization flaw in its CORS handling. A remote attacker who tricks a user into opening a crafted HTML page can bypass web origin policy.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browsers","desktop"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"attacker bypasses web origin policy to read cross-site data","analyst_note":"","how_to_check":"- Open Chrome and check the version under Settings > About Chrome, or run `chrome --version` on the command line.\n- Confirm whether the version is below `157.0.8103.38`.","plain_action":"Update Google Chrome to version 157.0.8103.38 or later through Chrome's About page.","needs_analyst":false,"not_affected_if":["chrome-updated"],"who_is_affected":"Any Chrome installation older than 157.0.8103.38 is exposed when a user visits an attacker-crafted page. Managed fleets running Chrome should be checked against the fixed version. The sources do not describe any non-default configuration required.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"low"},"cost_usd":0.000662,"input_tokens":4107,"output_tokens":503,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121205':14A,17A '-2026':13A,16A '157.0.8103.38':25B,62C 'allow':63C 'attack':37B,66C 'author':3A,29B,54C 'browser':18B 'bypass':9A,49B,71C 'chrome':1A,19B,23B,59C 'chromium':80C 'cor':2A,33B,56C 'craft':7A,45B,77C 'cve':12A,15A 'desktop':20B 'engin':69C 'flaw':4A,30B 'googl':22B,58C 'handl':34B 'html':46B,78C 'incorrect':28B,53C 'let':5A 'leverag':67C 'low':83C 'open':43B 'origin':10A,51B,73C 'page':8A,47B,79C 'polici':11A,52B,74C 'prior':60C 'remot':36B,65C 'runtim':21B 'secur':81C 'sever':82C 'social':68C 'trick':39B 'user':41B 'via':75C 'web':50B,72C","nicknames":[],"mitigations":[],"who_affected":"Any Chrome installation older than 157.0.8103.38 is exposed when a user visits an attacker-crafted page. Managed fleets running Chrome should be checked against the fixed version. The sources do not describe any non-default configuration required.","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 through Chrome's About page.","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-2026-121205","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121205","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"}