{"id":"CVE-2026-86868","kind":"vulnerability","aliases":["CVE-2026-86868"],"related":[],"title":"macOS: authentication state flaw lets an attacker impersonate other users","description":"An authentication issue was addressed with improved state management. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An attacker may be able to impersonate other users.","summary":"Apple fixed an authentication issue in macOS that stems from state management. An attacker may be able to impersonate other users on an affected Mac.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","macos"],"not_affected_if":[],"how_to_check":"- Check the installed macOS version under Apple menu > About This Mac, or run `sw_vers -productVersion`\n- Compare against the fixed builds: macOS Golden Gate 27, macOS Sequoia `15.8`, macOS Tahoe `26.7`","fix":"- Update macOS to Golden Gate 27, Sequoia `15.8`, or Tahoe `26.7` or later via System Settings > General > Software Update","status":"open","published_at":"2026-10-20T01:17:24+00:00","first_seen_at":"2026-10-23T21:57:19+00:00","triaged_at":"2026-10-25T05:06:10+00:00","updated_at":"2026-10-25T05:06:10+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-10-25T05:06:10Z","model":"claude-haiku-5-5","output":{"fix":"- Update macOS to Golden Gate 27, Sequoia `15.8`, or Tahoe `26.7` or later via System Settings > General > Software Update","reach":"unknown","title":"macOS: authentication state flaw lets an attacker impersonate other users","impact":"medium","summary":"Apple fixed an authentication issue in macOS that stems from state management. An attacker may be able to impersonate other users on an affected Mac.","category":"infrastructure","nicknames":[],"who_cares":["macos"],"confidence":0.4,"needs_auth":"unknown","worst_case":"Attacker impersonates other users on the Mac","analyst_note":"Find Apple's security content page for the fix to learn the component, trigger, attack vector and CVSS rating; the NVD entry gives none of these.","how_to_check":"- Check the installed macOS version under Apple menu > About This Mac, or run `sw_vers -productVersion`\n- Compare against the fixed builds: macOS Golden Gate 27, macOS Sequoia `15.8`, macOS Tahoe `26.7`","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown. The sources name the fixed macOS releases but do not describe the vulnerable component, the trigger, or the required configuration. Systems running earlier macOS builds on those release lines are the ones to look at.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000581,"input_tokens":3264,"output_tokens":510,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-86868':13A,16A '15.8':64C '26.7':67C '27':61C 'abl':35B,72C 'address':48C 'affect':42B 'appl':19B 'attack':7A,32B,69C 'authent':2A,22B,45C 'cve':11A,14A 'fix':20B,56C 'flaw':4A 'gate':60C 'golden':59C 'imperson':8A,37B,74C 'improv':50C 'infrastructur':17B 'issu':23B,46C,54C 'let':5A 'mac':43B 'maco':1A,18B,25B,58C,62C,65C 'manag':30B,52C 'may':33B,70C 'sequoia':63C 'state':3A,29B,51C 'stem':27B 'taho':66C 'user':10A,39B,76C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T01:17:24+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-86868","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86868","severity":null,"published_at":"2026-10-20T01:17:24+00:00","modified_at":"2026-10-20T15:03:59+00:00","first_seen_at":"2026-10-23T21:57:19+00:00","fetched_at":"2026-10-23T22:28:57+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"}