{"id":"CVE-2026-86907","kind":"vulnerability","aliases":["CVE-2026-86907"],"related":[],"title":"macOS: an admin-privileged app can modify the System Keychain","description":"An authorization issue was addressed with improved entitlement checks. This issue is fixed in macOS Sequoia 15.8, macOS Tahoe 26.7. An app with admin privileges may be able to modify the System Keychain.","summary":"Apple fixed an authorization flaw in macOS that lets an app holding admin privileges change the System Keychain. An attacker who already has admin rights on a Mac could alter stored system credentials and trust settings.","severity":"medium","cvss":4.4,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["apple-devices","fleet-management","infrastructure","macos"],"not_affected_if":["already-patched","standard-users-only"],"how_to_check":"- Run `sw_vers -productVersion` and compare against the fixed versions: `15.8` on macOS Sequoia, `26.7` on macOS Tahoe.","fix":"- Update macOS to `15.8` (Sequoia) or `26.7` (Tahoe) or later via System Settings > General > Software Update.","status":"open","published_at":"2026-10-20T01:17:26+00:00","first_seen_at":"2026-10-23T21:57:19+00:00","triaged_at":"2026-10-25T04:37:12+00:00","updated_at":"2026-10-25T04:37:12+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-10-25T04:37:12Z","model":"claude-haiku-5-5","output":{"fix":"- Update macOS to `15.8` (Sequoia) or `26.7` (Tahoe) or later via System Settings > General > Software Update.","reach":"local","title":"macOS: an admin-privileged app can modify the System Keychain","impact":"medium","summary":"Apple fixed an authorization flaw in macOS that lets an app holding admin privileges change the System Keychain. An attacker who already has admin rights on a Mac could alter stored system credentials and trust settings.","category":"infrastructure","nicknames":[],"who_cares":["macos","apple-devices","fleet-management"],"confidence":0.7,"needs_auth":"yes","worst_case":"Admin-level app alters System Keychain contents and trust settings","analyst_note":"","how_to_check":"- Run `sw_vers -productVersion` and compare against the fixed versions: `15.8` on macOS Sequoia, `26.7` on macOS Tahoe.","needs_analyst":false,"not_affected_if":["already-patched","standard-users-only"],"who_is_affected":"Macs running macOS Sequoia before 15.8 or macOS Tahoe before 26.7. The flaw needs an app that already runs with administrator privileges, so the risk is mainly to shared or managed Macs where admin rights are widely granted. Machines where only standard users run apps are less exposed.","user_interaction":"unknown","needs_special_setup":"no","severity_if_unknown":"unknown"},"cost_usd":0.000577,"input_tokens":3274,"output_tokens":500,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-86907':14A,17A '15.8':78C '26.7':81C 'abl':89C 'address':66C 'admin':4A,38B,49B,85C 'admin-privileg':3A 'alreadi':47B 'alter':55B 'app':6A,36B,83C 'appl':19B,26B 'apple-devic':18B 'attack':45B 'author':29B,63C 'chang':40B 'check':70C 'could':54B 'credenti':58B 'cve':12A,15A 'devic':20B 'entitl':69C 'fix':27B,74C 'flaw':30B 'fleet':22B 'fleet-manag':21B 'hold':37B 'improv':68C 'infrastructur':24B 'issu':64C,72C 'keychain':11A,43B,94C 'let':34B 'mac':53B 'maco':1A,25B,32B,76C,79C 'manag':23B 'may':87C 'modifi':8A,91C 'privileg':5A,39B,86C 'right':50B 'sequoia':77C 'set':61B 'store':56B 'system':10A,42B,57B,93C 'taho':80C 'trust':60B","nicknames":[],"mitigations":[],"who_affected":"Macs running macOS Sequoia before 15.8 or macOS Tahoe before 26.7. The flaw needs an app that already runs with administrator privileges, so the risk is mainly to shared or managed Macs where admin rights are widely granted. Machines where only standard users run apps are less exposed.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T01:17:26+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N","cvss_by":"134c704f-9b21-4f2e-91b3-4a467353bcc0","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-86907","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86907","severity":null,"published_at":"2026-10-20T01:17:26+00:00","modified_at":"2026-10-20T15:17:34+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"}