{"id":"CVE-2026-118207","kind":"vulnerability","aliases":["CVE-2026-118207"],"related":[],"title":"Microsoft Exchange Server: weak input checks let an authorized user run code","description":"Improper input validation in Microsoft Exchange Server allows an authorized attacker to execute code over a network.","summary":"Microsoft Exchange Server does not properly validate some input, so a user who already has an account can run code on the server over the network. The sources give no further detail on the affected code path or versions.","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","runtime","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:19:37+00:00","first_seen_at":"2026-11-10T19:24:50+00:00","triaged_at":"2026-11-10T19:30:12+00:00","updated_at":"2026-11-10T19:30:12+00:00","category":"runtime","confidence":0.4,"triage":{"at":"2026-11-10T19:30:12Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Exchange Server: weak input checks let an authorized user run code","impact":"high","summary":"Microsoft Exchange Server does not properly validate some input, so a user who already has an account can run code on the server over the network. The sources give no further detail on the affected code path or versions.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["exchange-server","windows"],"confidence":0.4,"fix_status":"unknown","needs_auth":"yes","worst_case":"Authorized attacker runs code on the Exchange server","analyst_note":"Find the affected versions, fixed builds and the Microsoft Security Response Center advisory for CVE-2026-118207; the sources give none.","how_to_check":"- unknown","plain_action":"","product_name":"Microsoft Exchange Server","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Organizations that run Microsoft Exchange Server on-premises. The sources do not name affected versions or the specific feature involved. unknown","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000658,"input_tokens":4484,"output_tokens":419,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the affected versions, fixed builds and the Microsoft Security Response Center advisory for CVE-2026-118207; the sources give none.","search":"'-118207':15A,18A '-2026':14A,17A 'account':43B 'affect':61B 'allow':73C 'alreadi':40B 'attack':76C 'author':9A,75C 'check':6A 'code':12A,46B,62B,79C 'cve':13A,16A 'detail':58B 'exchang':2A,23B,28B,71C 'exchange':20A 'exchange-serv':22B 'execut':78C 'give':55B 'improp':66C 'input':5A,35B,67C 'let':7A 'microsoft':1A,19A,27B,70C 'network':52B,82C 'path':63B 'proper':32B 'run':11A,45B 'runtim':25B 'server':3A,21A,24B,29B,49B,72C 'sourc':54B 'user':10A,38B 'valid':33B,68C 'version':65B 'weak':4A 'window':26B","nicknames":[],"mitigations":[],"who_affected":"Organizations that run Microsoft Exchange Server on-premises. The sources do not name affected versions or the specific feature involved. unknown","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","runtime","vendor","windows"],"campaign_type":null,"search_a":"'-118207':15A,18A '-2026':14A,17A 'author':9A 'check':6A 'code':12A 'cve':13A,16A 'exchang':2A 'exchange':20A 'input':5A 'let':7A 'microsoft':1A,19A 'run':11A 'server':3A,21A 'user':10A 'weak':4A","search_b":"'account':43B 'affect':61B 'alreadi':40B 'code':46B,62B 'detail':58B 'exchang':23B,28B 'exchange-serv':22B 'give':55B 'input':35B 'microsoft':27B 'network':52B 'path':63B 'proper':32B 'run':45B 'runtim':25B 'server':24B,29B,49B 'sourc':54B 'user':38B 'valid':33B 'version':65B 'window':26B","search_c":"'allow':73C 'attack':76C 'author':75C 'code':79C 'exchang':71C 'execut':78C 'improp':66C 'input':67C 'microsoft':70C 'network':82C 'server':72C 'valid':68C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:37+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-2026-118207","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118207","severity":null,"published_at":"2026-11-10T19:19:37+00:00","modified_at":"2026-11-10T19:19:37+00:00","first_seen_at":"2026-11-10T19:24:50+00:00","fetched_at":"2026-11-10T19:24:50+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"}