{"id":"CVE-2026-121059","kind":"vulnerability","aliases":["CVE-2026-121059"],"related":[],"title":"Google Chrome: crafted HTML page leaks cross-origin data to remote attackers","description":"Information leak in Core in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Medium)","summary":"A flaw in Chrome's Core component lets a crafted HTML page leak data from other websites, which the sources describe as cross-origin data. The Chromium project rates it Medium severity.","severity":"medium","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","endpoints","runtime"],"not_affected_if":["chrome-158-or-later","other-browsers"],"how_to_check":"- Check the installed Chrome version in chrome://settings/help and compare it with `157.0.8103.38`","fix":"- Google Chrome: move 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":"2026-11-03T21:27:09+00:00","updated_at":"2026-11-03T21:27:09+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-11-03T21:27:09Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.38` or later","reach":"internet","title":"Google Chrome: crafted HTML page leaks cross-origin data to remote attackers","impact":"medium","summary":"A flaw in Chrome's Core component lets a crafted HTML page leak data from other websites, which the sources describe as cross-origin data. The Chromium project rates it Medium severity.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browsers","endpoints"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Attacker reads cross-origin data from the victim's browser session","analyst_note":"","how_to_check":"- Check the installed Chrome version in chrome://settings/help and compare it with `157.0.8103.38`\n- unknown","plain_action":"Update Google Chrome to version 157.0.8103.38 or later: open the Chrome menu, go to Help, then About Google Chrome.","needs_analyst":false,"not_affected_if":["chrome-158-or-later","other-browsers"],"who_is_affected":"Anyone running Google Chrome before 157.0.8103.38 who visits a page an attacker controls. Exposure depends on the browser version and on visiting untrusted sites, not on server configuration. Teams that manage browsers should confirm managed endpoints are updated.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000667,"input_tokens":4094,"output_tokens":516,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121059':16A,19A '-2026':15A,18A '157.0.8103.38':66C 'allow':67C 'attack':13A,70C 'browser':20B 'chrome':2A,21B,27B,63C 'chromium':51B,82C 'compon':30B 'core':29B,60C 'craft':3A,33B,79C 'cross':8A,47B,74C 'cross-origin':7A,46B,73C 'cve':14A,17A 'data':10A,37B,49B,76C 'describ':44B 'endpoint':22B 'flaw':25B 'googl':1A,62C 'html':4A,34B,80C 'inform':57C 'leak':6A,36B,58C,72C 'let':31B 'medium':55B,85C 'origin':9A,48B,75C 'page':5A,35B,81C 'prior':64C 'project':52B 'rate':53B 'remot':12A,69C 'runtim':23B 'secur':83C 'sever':56B,84C 'sourc':43B 'via':77C 'websit':40B","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome before 157.0.8103.38 who visits a page an attacker controls. Exposure depends on the browser version and on visiting untrusted sites, not on server configuration. Teams that manage browsers should confirm managed endpoints are updated.","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: open the Chrome menu, go to Help, then About Google Chrome.","pkeys":[],"ptokens":[],"labels":["browsers","chrome","endpoints","medium","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-2026-121059","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121059","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"}