{"id":"CVE-2026-121174","kind":"vulnerability","aliases":["CVE-2026-121174"],"related":[],"title":"Chrome: missing authorization in BackgroundFetch lets a web page bypass origin policy","description":"Missing authorization in BackgroundFetch 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: High)","summary":"A crafted HTML page can make Google Chrome's BackgroundFetch feature bypass web origin policy, because it lacks an authorization check. An attacker who lures a user to the page can act across origin boundaries in the browser.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","linux","macos","other","windows"],"not_affected_if":["other-browsers","patched-chrome"],"how_to_check":"- Check the Chrome version with `chrome://version` and compare it to `157.0.8103.38`\n- Check managed fleets for Chrome builds older than `157.0.8103.38`","fix":"- Google Chrome: move to `157.0.8103.38` or later","status":"open","published_at":"2026-11-03T21:17:25+00:00","first_seen_at":"2026-11-03T21:19:24+00:00","triaged_at":"2026-11-03T21:23:15+00:00","updated_at":"2026-11-03T21:23:15+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-11-03T21:23:15Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.38` or later","reach":"internet","title":"Chrome: missing authorization in BackgroundFetch lets a web page bypass origin policy","impact":"medium","summary":"A crafted HTML page can make Google Chrome's BackgroundFetch feature bypass web origin policy, because it lacks an authorization check. An attacker who lures a user to the page can act across origin boundaries in the browser.","audience":"everyone","category":"other","nicknames":[],"who_cares":["chrome","browsers","windows","macos","linux"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Web page bypasses origin policy inside the browser","analyst_note":"","how_to_check":"- Check the Chrome version with `chrome://version` and compare it to `157.0.8103.38`\n- Check managed fleets for Chrome builds older than `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":["patched-chrome","other-browsers"],"who_is_affected":"Any browser running Chrome older than 157.0.8103.38 is exposed when it opens a crafted HTML page, so the risk is to end users who browse the web with Chrome. Managed fleets and kiosks running Chrome are in scope; users who only run a patched build are not affected.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000682,"input_tokens":4103,"output_tokens":544,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121174':15A,18A '-2026':14A,17A '157.0.8103.38':72C 'across':57B 'act':56B 'allow':73C 'attack':47B,76C 'author':3A,44B,64C 'backgroundfetch':5A,34B,66C 'boundari':59B 'browser':19B,62B 'bypass':10A,36B,78C 'check':45B 'chrome':1A,20B,32B,69C 'chromium':87C 'craft':26B,84C 'cve':13A,16A 'featur':35B 'googl':31B,68C 'high':90C 'html':27B,85C 'lack':42B 'let':6A 'linux':21B 'lure':49B 'maco':22B 'make':30B 'miss':2A,63C 'origin':11A,38B,58B,80C 'page':9A,28B,54B,86C 'polici':12A,39B,81C 'prior':70C 'remot':75C 'secur':88C 'sever':89C 'user':51B 'via':82C 'web':8A,37B,79C 'window':24B","nicknames":[],"mitigations":[],"who_affected":"Any browser running Chrome older than 157.0.8103.38 is exposed when it opens a crafted HTML page, so the risk is to end users who browse the web with Chrome. Managed fleets and kiosks running Chrome are in scope; users who only run a patched build are not affected.","tier":"B","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":["browsers","chrome","high","linux","macos","other","windows"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:25+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121174","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121174","severity":null,"published_at":"2026-11-03T21:17:25+00:00","modified_at":"2026-11-03T21:17:25+00:00","first_seen_at":"2026-11-03T21:19:24+00:00","fetched_at":"2026-11-03T21:19:24+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"}