{"id":"CVE-2025-26633","kind":"vulnerability","aliases":["CVE-2025-26633"],"related":[],"title":"Improper neutralization in Microsoft Management Console allows an unauthorized attacker to bypass a security feature…","description":"Microsoft Windows Management Console (MMC) contains an improper neutralization vulnerability that allows an unauthorized attacker to bypass a security feature locally.\n\nCISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","summary":"Microsoft Windows Management Console (MMC) fails to properly neutralize input, letting a local attacker bypass a Windows security feature. CISA lists it as actively exploited, with ransomware use noted in the catalog.","severity":"high","cvss":7.0,"epss":null,"exploited":true,"exploited_at":"2025-03-11T00:00:00+00:00","products":[{"name":"Microsoft Windows","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows 10 1507","fixed":["10.0.10240.20947"],"affected":"< 10.0.10240.20947","ecosystem":"vendor"},{"name":"microsoft windows 10 1607","fixed":["10.0.14393.7876"],"affected":"< 10.0.14393.7876","ecosystem":"vendor"},{"name":"microsoft windows 10 1809","fixed":["10.0.17763.7009"],"affected":"< 10.0.17763.7009","ecosystem":"vendor"},{"name":"microsoft windows 10 21h2","fixed":["10.0.19044.5608"],"affected":"< 10.0.19044.5608","ecosystem":"vendor"},{"name":"microsoft windows 10 22h2","fixed":["10.0.19045.5608"],"affected":"< 10.0.19045.5608","ecosystem":"vendor"},{"name":"microsoft windows 11 22h2","fixed":["10.0.22621.5039"],"affected":"< 10.0.22621.5039","ecosystem":"vendor"},{"name":"microsoft windows 11 23h2","fixed":["10.0.22631.5039"],"affected":"< 10.0.22631.5039","ecosystem":"vendor"},{"name":"microsoft windows 11 24h2","fixed":["10.0.26100.3403"],"affected":"< 10.0.26100.3403","ecosystem":"vendor"},{"name":"microsoft windows server 2008","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows server 2008","fixed":[],"affected":"= r2","ecosystem":"vendor"},{"name":"microsoft windows server 2012","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows server 2012","fixed":[],"affected":"= r2","ecosystem":"vendor"},{"name":"microsoft windows server 2016","fixed":["10.0.14393.7876"],"affected":"< 10.0.14393.7876","ecosystem":"vendor"},{"name":"microsoft windows server 2019","fixed":["10.0.17763.7009"],"affected":"< 10.0.17763.7009","ecosystem":"vendor"},{"name":"microsoft windows server 2022","fixed":["10.0.20348.3270"],"affected":"< 10.0.20348.3270","ecosystem":"vendor"},{"name":"microsoft windows server 2022 23h2","fixed":["10.0.25398.1486"],"affected":"< 10.0.25398.1486","ecosystem":"vendor"},{"name":"microsoft windows server 2025","fixed":["10.0.26100.3403"],"affected":"< 10.0.26100.3403","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","microsoft-mmc","ransomware","windows"],"not_affected_if":["unpatched-builds-only"],"how_to_check":null,"fix":"Apply the Microsoft patch for CVE-2025-26633 via Windows Update; the sources do not name the fixed build.\nFollow CISA's required action: apply vendor mitigations or discontinue use if mitigations are unavailable.","status":"open","published_at":"2025-03-11T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:52:11+00:00","updated_at":"2026-10-23T22:29:05+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T20:52:11Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft patch for CVE-2025-26633 via Windows Update; the sources do not name the fixed build.\nFollow CISA's required action: apply vendor mitigations or discontinue use if mitigations are unavailable.","reach":"local","impact":"high","summary":"Microsoft Windows Management Console (MMC) fails to properly neutralize input, letting a local attacker bypass a Windows security feature. CISA lists it as actively exploited, with ransomware use noted in the catalog.","category":"infrastructure","who_cares":["windows","microsoft-mmc"],"confidence":0.6,"needs_auth":"yes","worst_case":"Local attacker bypasses a Windows security feature, enabling privilege escalation and ransomware deployment","analyst_note":"Find the Microsoft Security Update Guide entry for CVE-2025-26633 to get fixed builds and the exact security feature bypassed, and how to check patch level.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["unpatched-builds-only"],"user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000469,"input_tokens":2660,"output_tokens":407,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':165C '-2025':17A,20A '-26633':18A,21A '10':26A,30A,34A,38A,42A '11':46A,50A,54A '1507':27A '1607':31A '1809':35A '2008':59A,63A '2012':67A,71A '2016':75A '2019':79A '2022':83A,87A '2025':92A '21h2':39A '22':164C '22h2':43A,47A '23h2':51A,88A '24h2':55A 'action':155C 'activ':123B 'allow':7A,143C 'appli':156C 'applic':162C 'attack':10A,113B,146C 'bod':163C 'bypass':12A,114B,148C 'catalog':131B 'cisa':119B,153C 'cloud':168C 'consol':6A,103B,135C 'contain':137C 'cve':16A,19A 'discontinu':171C 'exploit':93B,124B 'fail':105B 'featur':15A,118B,151C 'follow':161C 'guidanc':166C 'improp':1A,139C 'infrastructur':94B 'input':109B 'instruct':160C 'let':110B 'list':120B 'local':112B,152C 'manag':5A,102B,134C 'microsoft':4A,22A,24A,28A,32A,36A,40A,44A,48A,52A,56A,60A,64A,68A,72A,76A,80A,84A,89A,96B,100B,132C 'microsoft-mmc':95B 'mitig':157C,177C 'mmc':97B,104B,136C 'neutral':2A,108B,140C 'note':128B 'per':158C 'product':175C 'proper':107B 'ransomwar':98B,126B 'requir':154C 'secur':14A,117B,150C 'server':58A,62A,66A,70A,74A,78A,82A,86A,91A 'servic':169C 'unauthor':9A,145C 'unavail':179C 'use':127B,172C 'vendor':159C 'vulner':141C 'window':99B,101B,116B,133C 'windows':23A,25A,29A,33A,37A,41A,45A,49A,53A,57A,61A,65A,69A,73A,77A,81A,85A,90A","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2025-03-11T00:00:00+00:00","kev":{"dateAdded":"2025-03-11","dueDate":"2025-04-01","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2025-26633","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-26633","severity":null,"published_at":"2025-03-11T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T14:39:38+00:00","note":null},{"source":"nvd","external_id":"CVE-2025-26633","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-26633","severity":null,"published_at":"2025-03-11T17:16:43+00:00","modified_at":"2026-09-24T13:10:00+00:00","first_seen_at":"2026-10-23T22:29:05+00:00","fetched_at":"2026-10-23T22:29:05+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}