{"id":"CVE-2026-121222","kind":"vulnerability","aliases":["CVE-2026-121222"],"related":[],"title":"Chrome: crafted web page bypasses origin policy in Forms","description":"Incorrect authorization in Forms 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's Forms component did not check authorization correctly, so a crafted HTML page can get around web origin restrictions. The attacker gets to act across site boundaries in the browser, with Chromium rating the issue low severity.","severity":"low","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","chrome","desktop","runtime"],"not_affected_if":["chrome-updated"],"how_to_check":"- Open Chrome, go to `chrome://settings/help` and read the version number\n- Compare it against the fixed version `157.0.8103.38`","fix":"- Google Chrome: `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":"2026-11-03T21:21:28+00:00","updated_at":"2026-11-03T21:21:28+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-11-03T21:21:28Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: `157.0.8103.38` or later","reach":"internet","title":"Chrome: crafted web page bypasses origin policy in Forms","impact":"medium","summary":"Google Chrome's Forms component did not check authorization correctly, so a crafted HTML page can get around web origin restrictions. The attacker gets to act across site boundaries in the browser, with Chromium rating the issue low severity.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browser","desktop"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Attacker bypasses web origin policy from a crafted page","analyst_note":"","how_to_check":"- Open Chrome, go to `chrome://settings/help` and read the version number\n- Compare it against the fixed version `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":["chrome-updated"],"who_is_affected":"Anyone running Google Chrome before 157.0.8103.38 who visits a page an attacker controls. Chromium-based browsers that pull in the same fix are also exposed, and managed fleets should confirm the Chrome version across all machines.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"low"},"cost_usd":0.00066,"input_tokens":4099,"output_tokens":501,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121222':12A,15A '-2026':11A,14A '157.0.8103.38':68C 'across':46B 'act':45B 'allow':69C 'around':37B 'attack':42B,72C 'author':28B,60C 'boundari':48B 'browser':16B,51B 'bypass':5A,74C 'check':27B 'chrome':1A,17B,21B,65C 'chromium':53B,83C 'compon':24B 'correct':29B 'craft':2A,32B,80C 'cve':10A,13A 'desktop':18B 'form':9A,23B,62C 'get':36B,43B 'googl':20B,64C 'html':33B,81C 'incorrect':59C 'issu':56B 'low':57B,86C 'origin':6A,39B,76C 'page':4A,34B,82C 'polici':7A,77C 'prior':66C 'rate':54B 'remot':71C 'restrict':40B 'runtim':19B 'secur':84C 'sever':58B,85C 'site':47B 'via':78C 'web':3A,38B,75C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome before 157.0.8103.38 who visits a page an attacker controls. Chromium-based browsers that pull in the same fix are also exposed, and managed fleets should confirm the Chrome version across all machines.","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","low","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-2026-121222","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121222","severity":null,"published_at":"2026-11-03T21:17:31+00:00","modified_at":"2026-11-03T21:17:32+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"}