{"id":"CVE-2026-122987","kind":"vulnerability","aliases":["CVE-2026-122987"],"related":[],"title":"Microsoft HPC Pack: missing authentication lets an attacker gain higher privileges","description":"Missing authentication for critical function in Microsoft High Performance Computing (HPC) Pack allows an unauthorized attacker to elevate privileges over a network.","summary":"Microsoft High Performance Computing (HPC) Pack has a critical function that runs without an authentication check. An unauthorized attacker on the network can elevate their privileges.","severity":"medium","cvss":5.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["hpc-pack","microsoft","vendor","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:20:38+00:00","first_seen_at":"2026-11-10T19:25:11+00:00","triaged_at":"2026-11-10T19:59:57+00:00","updated_at":"2026-11-10T19:59:57+00:00","category":"vendor","confidence":0.5,"triage":{"at":"2026-11-10T19:59:57Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft HPC Pack: missing authentication lets an attacker gain higher privileges","impact":"high","summary":"Microsoft High Performance Computing (HPC) Pack has a critical function that runs without an authentication check. An unauthorized attacker on the network can elevate their privileges.","audience":"businesses","category":"vendor","nicknames":[],"who_cares":["windows","hpc-pack","microsoft"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"unauthorized attacker gains elevated privileges over the network","analyst_note":"Find the Microsoft Security Response Center advisory for CVE-2026-122987 to confirm affected HPC Pack versions and the fixed build.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Organizations running Microsoft HPC Pack clusters on their network. The sources do not say which HPC Pack versions or configurations are affected, so the exposed installs are unknown.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000658,"input_tokens":4504,"output_tokens":416,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-122987':14A,17A '-2026':13A,16A 'allow':62C 'attack':8A,42B,65C 'authent':5A,38B,51C 'check':39B 'comput':27B,59C 'critic':32B,53C 'cve':12A,15A 'elev':47B,67C 'function':33B,54C 'gain':9A 'high':25B,57C 'higher':10A 'hpc':2A,19B,28B,60C 'hpc-pack':18B 'let':6A 'microsoft':1A,21B,24B,56C 'miss':4A,50C 'network':45B,71C 'pack':3A,20B,29B,61C 'perform':26B,58C 'privileg':11A,49B,68C 'run':35B 'unauthor':41B,64C 'vendor':22B 'window':23B 'without':36B","nicknames":[],"mitigations":[],"who_affected":"Organizations running Microsoft HPC Pack clusters on their network. The sources do not say which HPC Pack versions or configurations are affected, so the exposed installs are unknown.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["hpcpack","medium","microsoft","vendor","windows"],"campaign_type":null,"search_a":"'-122987':14A,17A '-2026':13A,16A 'attack':8A 'authent':5A 'cve':12A,15A 'gain':9A 'higher':10A 'hpc':2A 'let':6A 'microsoft':1A 'miss':4A 'pack':3A 'privileg':11A","search_b":"'attack':42B 'authent':38B 'check':39B 'comput':27B 'critic':32B 'elev':47B 'function':33B 'high':25B 'hpc':19B,28B 'hpc-pack':18B 'microsoft':21B,24B 'network':45B 'pack':20B,29B 'perform':26B 'privileg':49B 'run':35B 'unauthor':41B 'vendor':22B 'window':23B 'without':36B","search_c":"'allow':62C 'attack':65C 'authent':51C 'comput':59C 'critic':53C 'elev':67C 'function':54C 'high':57C 'hpc':60C 'microsoft':56C 'miss':50C 'network':71C 'pack':61C 'perform':58C 'privileg':68C 'unauthor':64C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:20:38+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-122987","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-122987","severity":null,"published_at":"2026-11-10T19:20:38+00:00","modified_at":"2026-11-10T19:20:38+00:00","first_seen_at":"2026-11-10T19:25:11+00:00","fetched_at":"2026-11-10T19:25:11+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"}