{"id":"CVE-2026-121236","kind":"vulnerability","aliases":["CVE-2026-121236"],"related":[],"title":"Chrome: input validation flaw lets crafted page bypass web origin policy","description":"Improper input validation in Network 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 network component fails to validate input properly, so a crafted HTML page can get past web origin restrictions. An attacker who lures a user to that page could read or act on data from another site, and Chromium rates it Low severity.","severity":"low","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","chrome","desktop","vendor"],"not_affected_if":["chrome-up-to-date","non-chrome-browser"],"how_to_check":"- Open Chrome and check the version under Settings > About Chrome\n- Confirm the installed version is `157.0.8103.38` or later","fix":"- Google Chrome: update to `157.0.8103.38` or later","status":"open","published_at":"2026-11-03T21:17:33+00:00","first_seen_at":"2026-11-03T21:19:28+00:00","triaged_at":"2026-11-03T21:21:12+00:00","updated_at":"2026-11-03T21:21:12+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-11-03T21:21:12Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: update to `157.0.8103.38` or later","reach":"internet","title":"Chrome: input validation flaw lets crafted page bypass web origin policy","impact":"medium","summary":"Google Chrome's network component fails to validate input properly, so a crafted HTML page can get past web origin restrictions. An attacker who lures a user to that page could read or act on data from another site, and Chromium rates it Low severity.","audience":"everyone","category":"vendor","nicknames":[],"who_cares":["chrome","browser","desktop"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"crafted page reads cross-origin data from another site","analyst_note":"","how_to_check":"- Open Chrome and check the version under Settings > About Chrome\n- Confirm the installed version is `157.0.8103.38` or later","plain_action":"Update Google Chrome to version 157.0.8103.38 or later by restarting it after the update installs.","needs_analyst":false,"not_affected_if":["chrome-up-to-date","non-chrome-browser"],"who_is_affected":"Anyone running Google Chrome older than 157.0.8103.38 on desktop. Exposure requires the user to visit a page the attacker controls, so managed browsers that block such sites are less exposed.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"low"},"cost_usd":0.000654,"input_tokens":4093,"output_tokens":489,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121236':14A,17A '-2026':13A,16A '157.0.8103.38':77C 'act':55B 'allow':78C 'anoth':59B 'attack':44B,81C 'browser':18B 'bypass':8A,83C 'chrome':1A,19B,23B,74C 'chromium':62B,92C 'compon':26B 'could':52B 'craft':6A,34B,89C 'cve':12A,15A 'data':57B 'desktop':20B 'fail':27B 'flaw':4A 'get':38B 'googl':22B,73C 'html':35B,90C 'improp':67C 'input':2A,30B,68C 'let':5A 'low':65B,95C 'lure':46B 'network':25B,71C 'origin':10A,41B,85C 'page':7A,36B,51B,91C 'past':39B 'polici':11A,86C 'prior':75C 'proper':31B 'rate':63B 'read':53B 'remot':80C 'restrict':42B 'secur':93C 'sever':66B,94C 'site':60B 'user':48B 'valid':3A,29B,69C 'vendor':21B 'via':87C 'web':9A,40B,84C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome older than 157.0.8103.38 on desktop. Exposure requires the user to visit a page the attacker controls, so managed browsers that block such sites are less exposed.","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 by restarting it after the update installs.","pkeys":[],"ptokens":[],"labels":["browser","chrome","desktop","low","vendor"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:33+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121236","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121236","severity":null,"published_at":"2026-11-03T21:17:33+00:00","modified_at":"2026-11-03T21:17:33+00:00","first_seen_at":"2026-11-03T21:19:28+00:00","fetched_at":"2026-11-03T21:19:28+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"}