{"id":"CVE-2026-88247","kind":"vulnerability","aliases":["CVE-2026-88247"],"related":[],"title":"Windows Program Compatibility Assistant: uninitialized memory leaks data to local users","description":"Use of uninitialized resource in Windows Program Compatibility Assistant Service allows an authorized attacker to disclose information locally.","summary":"Windows Program Compatibility Assistant Service reads a resource before it is initialized. A logged-in attacker with local access can read information from memory they should not see.","severity":"medium","cvss":5.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:21:34+00:00","first_seen_at":"2026-11-10T19:25:20+00:00","triaged_at":"2026-11-10T20:00:30+00:00","updated_at":"2026-11-10T20:00:30+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-10T20:00:30Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Program Compatibility Assistant: uninitialized memory leaks data to local users","impact":"low","summary":"Windows Program Compatibility Assistant Service reads a resource before it is initialized. A logged-in attacker with local access can read information from memory they should not see.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user reads leaked information from service memory","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-88247 for affected Windows builds and the patch.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Affects Windows systems where the Program Compatibility Assistant Service runs. Exposure requires an authorized local account, so shared or multi-user machines carry more risk than single-user devices. The sources do not name affected Windows builds.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000651,"input_tokens":4498,"output_tokens":402,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-88247':14A,17A 'access':39B 'allow':59C 'assist':4A,23B,57C 'attack':36B,62C 'author':61C 'compat':3A,22B,56C 'cve':12A,15A 'data':8A 'disclos':64C 'inform':42B,65C 'infrastructur':18B 'initi':31B 'leak':7A 'local':10A,38B,66C 'log':34B 'logged-in':33B 'memori':6A,44B 'program':2A,21B,55C 'read':25B,41B 'resourc':27B,52C 'see':48B 'servic':24B,58C 'uniniti':5A,51C 'use':49C 'user':11A 'window':1A,19B,20B,54C","nicknames":[],"mitigations":[],"who_affected":"Affects Windows systems where the Program Compatibility Assistant Service runs. Exposure requires an authorized local account, so shared or multi-user machines carry more risk than single-user devices. The sources do not name affected Windows builds.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["infrastructure","medium","windows"],"campaign_type":null,"search_a":"'-2026':13A,16A '-88247':14A,17A 'assist':4A 'compat':3A 'cve':12A,15A 'data':8A 'leak':7A 'local':10A 'memori':6A 'program':2A 'uniniti':5A 'user':11A 'window':1A","search_b":"'access':39B 'assist':23B 'attack':36B 'compat':22B 'inform':42B 'infrastructur':18B 'initi':31B 'local':38B 'log':34B 'logged-in':33B 'memori':44B 'program':21B 'read':25B,41B 'resourc':27B 'see':48B 'servic':24B 'window':19B,20B","search_c":"'allow':59C 'assist':57C 'attack':62C 'author':61C 'compat':56C 'disclos':64C 'inform':65C 'local':66C 'program':55C 'resourc':52C 'servic':58C 'uniniti':51C 'use':49C 'window':54C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:34+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-88247","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88247","severity":null,"published_at":"2026-11-10T19:21:34+00:00","modified_at":"2026-11-10T19:21:34+00:00","first_seen_at":"2026-11-10T19:25:20+00:00","fetched_at":"2026-11-10T19:25:20+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}