{"id":"CVE-2026-20805","kind":"vulnerability","aliases":["CVE-2026-20805"],"related":[],"title":"Exposure of sensitive information to an unauthorized actor in Desktop Windows Manager allows an authorized attacker…","description":"Microsoft Windows Desktop Windows Manager contains an information disclosure vulnerability that allows an authorized attacker to disclose information 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 Desktop Window Manager has an information disclosure bug that lets an authorized local user read data they should not see. CISA lists it as actively exploited, so attackers are using it in the wild.","severity":"medium","cvss":5.5,"epss":null,"exploited":true,"exploited_at":"2026-01-13T00:00:00+00:00","products":[{"name":"Microsoft Windows","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows 10 1607","fixed":["10.0.14393.8783"],"affected":"< 10.0.14393.8783","ecosystem":"vendor"},{"name":"microsoft windows 10 1809","fixed":["10.0.17763.8276"],"affected":"< 10.0.17763.8276","ecosystem":"vendor"},{"name":"microsoft windows 10 21h2","fixed":["10.0.19044.6809"],"affected":"< 10.0.19044.6809","ecosystem":"vendor"},{"name":"microsoft windows 10 22h2","fixed":["10.0.19045.6809"],"affected":"< 10.0.19045.6809","ecosystem":"vendor"},{"name":"microsoft windows 11 23h2","fixed":["10.0.22631.6491"],"affected":"< 10.0.22631.6491","ecosystem":"vendor"},{"name":"microsoft windows 11 24h2","fixed":["10.0.26100.7623"],"affected":"< 10.0.26100.7623","ecosystem":"vendor"},{"name":"microsoft windows 11 25h2","fixed":["10.0.26200.7623"],"affected":"< 10.0.26200.7623","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":["10.0.14393.8783"],"affected":"< 10.0.14393.8783","ecosystem":"vendor"},{"name":"microsoft windows server 2019","fixed":["10.0.17763.8276"],"affected":"< 10.0.17763.8276","ecosystem":"vendor"},{"name":"microsoft windows server 2022","fixed":["10.0.20348.4648"],"affected":"< 10.0.20348.4648","ecosystem":"vendor"},{"name":"microsoft windows server 2022 23h2","fixed":["10.0.25398.2092"],"affected":"< 10.0.25398.2092","ecosystem":"vendor"},{"name":"microsoft windows server 2025","fixed":["10.0.26100.7623"],"affected":"< 10.0.26100.7623","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","self-hosted","windows"],"not_affected_if":["non-windows"],"how_to_check":null,"fix":"Apply the Microsoft update for CVE-2026-20805 or follow the vendor mitigations CISA references; the sources do not name the patched build.","status":"open","published_at":"2026-01-13T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:42:37+00:00","updated_at":"2026-10-23T23:44:51+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T20:42:37Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft update for CVE-2026-20805 or follow the vendor mitigations CISA references; the sources do not name the patched build.","reach":"local","summary":"Microsoft Windows Desktop Window Manager has an information disclosure bug that lets an authorized local user read data they should not see. CISA lists it as actively exploited, so attackers are using it in the wild.","category":"infrastructure","who_cares":["windows","self-hosted"],"confidence":0.6,"needs_auth":"yes","worst_case":"Local attacker with a valid account reads sensitive information from other processes or users.","analyst_note":"Find the Microsoft advisory for CVE-2026-20805 to get affected builds, the patch KB, and the exact data disclosed.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["non-windows"],"user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000419,"input_tokens":2525,"output_tokens":333,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':155C '-2026':18A,21A '-20805':19A,22A '10':27A,31A,35A,39A '11':43A,47A,51A '1607':28A '1809':32A '2012':56A,60A '2016':64A '2019':68A '2022':72A,76A '2025':81A '21h2':36A '22':154C '22h2':40A '23h2':44A,77A '24h2':48A '25h2':52A 'action':145C 'activ':114B 'actor':8A 'allow':13A,135C 'appli':146C 'applic':152C 'attack':16A,117B,138C 'author':15A,101B,137C 'bod':153C 'bug':97B 'cisa':110B,143C 'cloud':158C 'contain':129C 'cve':17A,20A 'data':105B 'desktop':10A,90B,126C 'disclos':140C 'disclosur':96B,132C 'discontinu':161C 'exploit':82B,115B 'exposur':1A 'follow':151C 'guidanc':156C 'host':86B 'inform':4A,95B,131C,141C 'infrastructur':83B 'instruct':150C 'let':99B 'list':111B 'local':102B,142C 'manag':12A,92B,128C 'microsoft':23A,25A,29A,33A,37A,41A,45A,49A,53A,57A,61A,65A,69A,73A,78A,88B,124C 'mitig':147C,167C 'per':148C 'product':165C 'read':104B 'requir':144C 'see':109B 'self':85B 'self-host':84B 'sensit':3A 'server':55A,59A,63A,67A,71A,75A,80A 'servic':159C 'unauthor':7A 'unavail':169C 'use':119B,162C 'user':103B 'vendor':149C 'vulner':133C 'wild':123B 'window':11A,87B,89B,91B,125C,127C 'windows':24A,26A,30A,34A,38A,42A,46A,50A,54A,58A,62A,66A,70A,74A,79A","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2026-01-13T00:00:00+00:00","kev":{"dateAdded":"2026-01-13","dueDate":"2026-02-03","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":"Unknown"},"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2026-20805","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-20805","severity":null,"published_at":"2026-01-13T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T13:39:29+00:00","note":null},{"source":"nvd","external_id":"CVE-2026-20805","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20805","severity":null,"published_at":"2026-01-13T18:16:07+00:00","modified_at":"2026-07-30T21:16:56+00:00","first_seen_at":"2026-10-23T23:44:51+00:00","fetched_at":"2026-10-23T23:44:51+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"}