{"id":"CVE-2026-118737","kind":"vulnerability","aliases":["CVE-2026-118737"],"related":[],"title":"Windows RPC Runtime: weak signature check lets attackers run code remotely","description":"Improper verification of cryptographic signature in Windows Remote Procedure Call Runtime allows an unauthorized attacker to execute code over a network.","summary":"The Windows Remote Procedure Call runtime does not properly verify a cryptographic signature. An unauthenticated attacker on the network can execute code on an affected Windows machine.","severity":"high","cvss":8.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","rpc","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:19:50+00:00","first_seen_at":"2026-11-10T19:24:55+00:00","triaged_at":"2026-11-10T19:34:47+00:00","updated_at":"2026-11-10T19:34:47+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T19:34:47Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Windows RPC Runtime: weak signature check lets attackers run code remotely","impact":"high","summary":"The Windows Remote Procedure Call runtime does not properly verify a cryptographic signature. An unauthenticated attacker on the network can execute code on an affected Windows machine.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","rpc"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"Code runs on the Windows machine over the network","analyst_note":"Find the Microsoft advisory for CVE-2026-118737 to confirm affected Windows builds, patch KB and exploitation conditions.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Windows machines that expose RPC over the network are the systems to look at; the sources do not name affected Windows builds or whether default configurations are reachable. unknown","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000647,"input_tokens":4503,"output_tokens":394,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the Microsoft advisory for CVE-2026-118737 to confirm affected Windows builds, patch KB and exploitation conditions.","search":"'-118737':14A,17A '-2026':13A,16A 'affect':45B 'allow':59C 'attack':8A,36B,62C 'call':25B,57C 'check':6A 'code':10A,42B,65C 'cryptograph':32B,51C 'cve':12A,15A 'execut':41B,64C 'improp':48C 'infrastructur':18B 'let':7A 'machin':47B 'network':39B,68C 'procedur':24B,56C 'proper':29B 'remot':11A,23B,55C 'rpc':2A,19B 'run':9A 'runtim':3A,26B,58C 'signatur':5A,33B,52C 'unauthent':35B 'unauthor':61C 'verif':49C 'verifi':30B 'weak':4A 'window':1A,20B,22B,46B,54C","nicknames":[],"mitigations":[],"who_affected":"Windows machines that expose RPC over the network are the systems to look at; the sources do not name affected Windows builds or whether default configurations are reachable. unknown","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","rpc","windows"],"campaign_type":null,"search_a":"'-118737':14A,17A '-2026':13A,16A 'attack':8A 'check':6A 'code':10A 'cve':12A,15A 'let':7A 'remot':11A 'rpc':2A 'run':9A 'runtim':3A 'signatur':5A 'weak':4A 'window':1A","search_b":"'affect':45B 'attack':36B 'call':25B 'code':42B 'cryptograph':32B 'execut':41B 'infrastructur':18B 'machin':47B 'network':39B 'procedur':24B 'proper':29B 'remot':23B 'rpc':19B 'runtim':26B 'signatur':33B 'unauthent':35B 'verifi':30B 'window':20B,22B,46B","search_c":"'allow':59C 'attack':62C 'call':57C 'code':65C 'cryptograph':51C 'execut':64C 'improp':48C 'network':68C 'procedur':56C 'remot':55C 'runtim':58C 'signatur':52C 'unauthor':61C 'verif':49C 'window':54C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:50+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-118737","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118737","severity":null,"published_at":"2026-11-10T19:19:50+00:00","modified_at":"2026-11-10T19:19:50+00:00","first_seen_at":"2026-11-10T19:24:55+00:00","fetched_at":"2026-11-10T19:24:55+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"}