{"id":"CVE-2026-118337","kind":"vulnerability","aliases":["CVE-2026-118337"],"related":[],"title":"Google Chrome: Forms access control flaw lets a web page bypass origin policy","description":"Improper access control in Forms in Google Chrome prior to 156.0.8078.73 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: High)","summary":"A flaw in the Forms component of Google Chrome before 156.0.8078.73 lets a remote attacker bypass the web origin policy using a crafted HTML page. The sources describe the bypass only in general terms, so the exact data an attacker can reach is unknown.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","end-users","endpoints","runtime"],"not_affected_if":["already-patched-chrome"],"how_to_check":"- Run the Chrome version check (chrome://version) and compare the result with `156.0.8078.73`\n- unknown","fix":"- Update Google Chrome to `156.0.8078.73` or later\n- unknown","status":"open","published_at":"2026-10-27T23:17:02+00:00","first_seen_at":"2026-10-27T23:29:43+00:00","triaged_at":"2026-10-27T23:31:46+00:00","updated_at":"2026-10-27T23:31:46+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-10-27T23:31:46Z","model":"claude-haiku-5-5","output":{"fix":"- Update Google Chrome to `156.0.8078.73` or later\n- unknown","reach":"internet","title":"Google Chrome: Forms access control flaw lets a web page bypass origin policy","impact":"medium","summary":"A flaw in the Forms component of Google Chrome before 156.0.8078.73 lets a remote attacker bypass the web origin policy using a crafted HTML page. The sources describe the bypass only in general terms, so the exact data an attacker can reach is unknown.","category":"runtime","nicknames":[],"who_cares":["chrome","browsers","endpoints","end-users"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker bypasses web origin policy, reading or acting on other sites' data","analyst_note":"Check the Chromium release notes and the NVD entry for what data the origin bypass exposes and whether the fixed version is confirmed.","how_to_check":"- Run the Chrome version check (chrome://version) and compare the result with `156.0.8078.73`\n- unknown","needs_analyst":true,"not_affected_if":["already-patched-chrome"],"who_is_affected":"Anyone running Google Chrome before `156.0.8078.73` on a desktop where a user can visit a web page, including managed fleets that delay browser updates. Browsers already on `156.0.8078.73` or later are not affected. The sources do not say whether any particular Chrome configuration changes exposure.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000594,"input_tokens":3284,"output_tokens":531,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-118337':16A,19A '-2026':15A,18A '156.0.8078.73':37B,81C 'access':4A,72C 'allow':82C 'attack':41B,66B,85C 'browser':20B 'bypass':11A,42B,56B,87C 'chrome':2A,21B,35B,78C 'chromium':96C 'compon':32B 'control':5A,73C 'craft':49B,93C 'cve':14A,17A 'data':64B 'describ':54B 'end':23B 'end-us':22B 'endpoint':25B 'exact':63B 'flaw':6A,28B 'form':3A,31B,75C 'general':59B 'googl':1A,34B,77C 'high':99C 'html':50B,94C 'improp':71C 'let':7A,38B 'origin':12A,45B,89C 'page':10A,51B,95C 'polici':13A,46B,90C 'prior':79C 'reach':68B 'remot':40B,84C 'runtim':26B 'secur':97C 'sever':98C 'sourc':53B 'term':60B 'unknown':70B 'use':47B 'user':24B 'via':91C 'web':9A,44B,88C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome before `156.0.8078.73` on a desktop where a user can visit a web page, including managed fleets that delay browser updates. Browsers already on `156.0.8078.73` or later are not affected. The sources do not say whether any particular Chrome configuration changes exposure.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T23:17:02+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-118337","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118337","severity":null,"published_at":"2026-10-27T23:17:02+00:00","modified_at":"2026-10-27T23:17:02+00:00","first_seen_at":"2026-10-27T23:29:43+00:00","fetched_at":"2026-10-27T23:29:43+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"}