{"id":"CVE-2026-118149","kind":"vulnerability","aliases":["CVE-2026-118149"],"related":[],"title":"Microsoft Exchange Server: authorized user can run code over network","description":"Improper control of generation of code ('code injection') in Microsoft Exchange Server allows an authorized attacker to execute code over a network.","summary":"A code injection flaw in Microsoft Exchange Server lets an attacker who already holds a valid account run code on the server across the network. The sources give a CVSS score of 8.8 and no further detail.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Microsoft Exchange Server","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exchange-server","on-premises-email","runtime","windows"],"not_affected_if":["exchange-online-only"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:19:36+00:00","first_seen_at":"2026-11-10T19:24:49+00:00","triaged_at":"2026-11-10T19:30:15+00:00","updated_at":"2026-11-10T19:30:15+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-11-10T19:30:15Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Exchange Server: authorized user can run code over network","impact":"high","summary":"A code injection flaw in Microsoft Exchange Server lets an attacker who already holds a valid account run code on the server across the network. The sources give a CVSS score of 8.8 and no further detail.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["exchange-server","windows","on-premises-email"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"Attacker runs code on the Exchange server over the network","analyst_note":"Find the Microsoft Security Response Center advisory for CVE-2026-118149 to confirm affected builds, fixed cumulative updates and any mitigation.","how_to_check":"- unknown","plain_action":"","product_name":"Microsoft Exchange Server","needs_analyst":true,"not_affected_if":["exchange-online-only"],"who_is_affected":"Organizations running Microsoft Exchange Server on-premises are the likely exposure; the sources do not name affected builds or configurations. Anyone using Exchange Online only is not affected by this entry, but the sources do not state that directly.","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000688,"input_tokens":4496,"output_tokens":476,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the Microsoft Security Response Center advisory for CVE-2026-118149 to confirm affected builds, fixed cumulative updates and any mitigation.","search":"'-118149':13A,16A '-2026':12A,15A '8.8':61B 'account':45B 'across':51B 'allow':78C 'alreadi':41B 'attack':39B,81C 'author':4A,80C 'code':8A,30B,47B,71C,72C,84C 'control':67C 'cve':11A,14A 'cvss':58B 'detail':65B 'email':26B 'exchang':2A,21B,35B,76C 'exchange':18A 'exchange-serv':20B 'execut':83C 'flaw':32B 'generat':69C 'give':56B 'hold':42B 'improp':66C 'inject':31B,73C 'let':37B 'microsoft':1A,17A,34B,75C 'network':10A,53B,87C 'on-premises-email':23B 'premis':25B 'run':7A,46B 'runtim':27B 'score':59B 'server':3A,19A,22B,36B,50B,77C 'sourc':55B 'user':5A 'valid':44B 'window':28B","nicknames":[],"mitigations":[],"who_affected":"Organizations running Microsoft Exchange Server on-premises are the likely exposure; the sources do not name affected builds or configurations. Anyone using Exchange Online only is not affected by this entry, but the sources do not state that directly.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":["exchangeserver","microsoftexchangeserver"],"ptokens":["exchange","microsoft","server"],"labels":["exchangeserver","high","onpremisesemail","runtime","vendor","windows"],"campaign_type":null,"search_a":"'-118149':13A,16A '-2026':12A,15A 'author':4A 'code':8A 'cve':11A,14A 'exchang':2A 'exchange':18A 'microsoft':1A,17A 'network':10A 'run':7A 'server':3A,19A 'user':5A","search_b":"'8.8':61B 'account':45B 'across':51B 'alreadi':41B 'attack':39B 'code':30B,47B 'cvss':58B 'detail':65B 'email':26B 'exchang':21B,35B 'exchange-serv':20B 'flaw':32B 'give':56B 'hold':42B 'inject':31B 'let':37B 'microsoft':34B 'network':53B 'on-premises-email':23B 'premis':25B 'run':46B 'runtim':27B 'score':59B 'server':22B,36B,50B 'sourc':55B 'valid':44B 'window':28B","search_c":"'allow':78C 'attack':81C 'author':80C 'code':71C,72C,84C 'control':67C 'exchang':76C 'execut':83C 'generat':69C 'improp':66C 'inject':73C 'microsoft':75C 'network':87C 'server':77C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:36+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-118149","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118149","severity":null,"published_at":"2026-11-10T19:19:36+00:00","modified_at":"2026-11-10T19:19:36+00:00","first_seen_at":"2026-11-10T19:24:49+00:00","fetched_at":"2026-11-10T19:24:49+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"}