{"id":"CVE-2026-121054","kind":"vulnerability","aliases":["CVE-2026-121054"],"related":[],"title":"Chrome: XML state validation flaw lets a web page bypass origin policy","description":"Improper state validation in XML 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 improper state validation flaw in its XML handling. A crafted HTML page can bypass web origin policy, which may let it read or act on data from other sites.","severity":"low","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","end-users","runtime"],"not_affected_if":["chrome-up-to-date"],"how_to_check":"- Check the installed Chrome version in Chrome's About page (chrome://settings/help)\n- Compare it with `157.0.8103.38`; anything older is affected","fix":"- Google Chrome: update to `157.0.8103.38` or later","status":"open","published_at":"2026-11-03T21:17:10+00:00","first_seen_at":"2026-11-03T21:19:10+00:00","triaged_at":"2026-11-03T21:27:13+00:00","updated_at":"2026-11-03T21:27:13+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-11-03T21:27:13Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: update to `157.0.8103.38` or later","reach":"internet","title":"Chrome: XML state validation flaw lets a web page bypass origin policy","impact":"medium","summary":"Google Chrome before 157.0.8103.38 has an improper state validation flaw in its XML handling. A crafted HTML page can bypass web origin policy, which may let it read or act on data from other sites.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browsers","end-users"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"A malicious web page bypasses origin policy to read other sites' data","analyst_note":"","how_to_check":"- Check the installed Chrome version in Chrome's About page (chrome://settings/help)\n- Compare it with `157.0.8103.38`; anything older is affected","plain_action":"Update Google Chrome to version 157.0.8103.38 or later through its built-in update check.","needs_analyst":false,"not_affected_if":["chrome-up-to-date"],"who_is_affected":"Any user running Google Chrome before 157.0.8103.38 who visits a page an attacker controls. Exposure comes from browsing alone, with no special configuration needed. Chromium-based browsers may ship the same fix on their own schedule, which the sources do not cover.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"low"},"cost_usd":0.000663,"input_tokens":4093,"output_tokens":508,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121054':15A,18A '-2026':14A,17A '157.0.8103.38':28B,70C 'act':54B 'allow':71C 'attack':74C 'browser':19B 'bypass':10A,44B,76C 'chrome':1A,20B,26B,67C 'chromium':85C 'craft':40B,82C 'cve':13A,16A 'data':56B 'end':22B 'end-us':21B 'flaw':5A,34B 'googl':25B,66C 'handl':38B 'html':41B,83C 'improp':31B,60C 'let':6A,50B 'low':88C 'may':49B 'origin':11A,46B,78C 'page':9A,42B,84C 'polici':12A,47B,79C 'prior':68C 'read':52B 'remot':73C 'runtim':24B 'secur':86C 'sever':87C 'site':59B 'state':3A,32B,61C 'user':23B 'valid':4A,33B,62C 'via':80C 'web':8A,45B,77C 'xml':2A,37B,64C","nicknames":[],"mitigations":[],"who_affected":"Any user running Google Chrome before 157.0.8103.38 who visits a page an attacker controls. Exposure comes from browsing alone, with no special configuration needed. Chromium-based browsers may ship the same fix on their own schedule, which the sources do not cover.","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 its built-in update check.","pkeys":[],"ptokens":[],"labels":["browsers","chrome","endusers","low","runtime"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:10+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121054","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121054","severity":null,"published_at":"2026-11-03T21:17:10+00:00","modified_at":"2026-11-03T21:17:10+00:00","first_seen_at":"2026-11-03T21:19:10+00:00","fetched_at":"2026-11-03T21:19:10+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"}