{"id":"CVE-2024-30040","kind":"vulnerability","aliases":["CVE-2024-30040"],"related":[],"title":"Windows MSHTML Platform Security Feature Bypass Vulnerability","description":"Microsoft Windows MSHTML Platform contains an unspecified vulnerability that allows for a security feature bypass.\n\nCISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","summary":"Microsoft Windows MSHTML Platform has a security feature bypass flaw that CISA lists as actively exploited. The sources do not say what the attacker bypasses or how the exploit is delivered.","severity":"high","cvss":8.8,"epss":null,"exploited":true,"exploited_at":"2024-05-14T00:00:00+00:00","products":[{"name":"Microsoft Windows","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows 10 1507","fixed":["10.0.10240.20651"],"affected":"< 10.0.10240.20651","ecosystem":"vendor"},{"name":"microsoft windows 10 1607","fixed":["10.0.14393.6981"],"affected":"< 10.0.14393.6981","ecosystem":"vendor"},{"name":"microsoft windows 10 1809","fixed":["10.0.17763.5820"],"affected":"< 10.0.17763.5820","ecosystem":"vendor"},{"name":"microsoft windows 10 21h2","fixed":["10.0.19044.4412"],"affected":"< 10.0.19044.4412","ecosystem":"vendor"},{"name":"microsoft windows 10 22h2","fixed":["10.0.19045.4412"],"affected":"< 10.0.19045.4412","ecosystem":"vendor"},{"name":"microsoft windows 11 21h2","fixed":["10.0.22000.2960"],"affected":"< 10.0.22000.2960","ecosystem":"vendor"},{"name":"microsoft windows 11 22h2","fixed":["10.0.22621.3593"],"affected":"< 10.0.22621.3593","ecosystem":"vendor"},{"name":"microsoft windows 11 23h2","fixed":["10.0.22631.3593"],"affected":"< 10.0.22631.3593","ecosystem":"vendor"},{"name":"microsoft windows server 2016","fixed":["10.0.14393.6981"],"affected":"< 10.0.14393.6981","ecosystem":"vendor"},{"name":"microsoft windows server 2019","fixed":["10.0.17763.5820"],"affected":"< 10.0.17763.5820","ecosystem":"vendor"},{"name":"microsoft windows server 2022","fixed":["10.0.20348.2458"],"affected":"< 10.0.20348.2458","ecosystem":"vendor"},{"name":"microsoft windows server 2022 23h2","fixed":["10.0.25398.887"],"affected":"< 10.0.25398.887","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","mshtml","windows"],"not_affected_if":[],"how_to_check":null,"fix":"Apply the Microsoft update for CVE-2024-30040 or the vendor mitigations; the sources do not name the patch or build.","status":"open","published_at":"2024-05-14T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T21:00:44+00:00","updated_at":"2026-10-23T22:29:05+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-10-23T21:00:44Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft update for CVE-2024-30040 or the vendor mitigations; the sources do not name the patch or build.","reach":"unknown","impact":"medium","summary":"Microsoft Windows MSHTML Platform has a security feature bypass flaw that CISA lists as actively exploited. The sources do not say what the attacker bypasses or how the exploit is delivered.","category":"infrastructure","who_cares":["windows","mshtml"],"confidence":0.4,"needs_auth":"unknown","worst_case":"unknown; sources say only a security feature bypass, exploited in the wild","analyst_note":"Find the Microsoft advisory for CVE-2024-30040 to get affected builds, patch KB numbers, and whether exploitation chains with user interaction or a document.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":[],"user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000453,"input_tokens":2808,"output_tokens":345,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2024':9A,12A '-30040':10A,13A '10':18A,22A,26A,30A,34A '11':38A,42A,46A '1507':19A '1607':23A '1809':27A '2016':51A '2019':55A '2022':59A,63A '21h2':31A,39A '22h2':35A,43A '23h2':47A,64A 'action':117C 'activ':83B 'allow':109C 'appli':118C 'attack':92B 'bypass':6A,77B,93B,114C 'cisa':80B,115C 'contain':104C 'cve':8A,11A 'deliv':99B 'discontinu':124C 'exploit':65B,84B,97B 'featur':5A,76B,113C 'flaw':78B 'infrastructur':66B 'instruct':122C 'list':81B 'microsoft':14A,16A,20A,24A,28A,32A,36A,40A,44A,48A,52A,56A,60A,69B,100C 'mitig':119C,130C 'mshtml':2A,67B,71B,102C 'per':120C 'platform':3A,72B,103C 'product':128C 'requir':116C 'say':89B 'secur':4A,75B,112C 'server':50A,54A,58A,62A 'sourc':86B 'unavail':132C 'unspecifi':106C 'use':125C 'vendor':121C 'vulner':7A,107C 'window':1A,68B,70B,101C 'windows':15A,17A,21A,25A,29A,33A,37A,41A,45A,49A,53A,57A,61A","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2024-05-14T00:00:00+00:00","kev":{"dateAdded":"2024-05-14","dueDate":"2024-06-04","requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/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-2024-30040","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2024-30040","severity":null,"published_at":"2024-05-14T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T11:39:15+00:00","note":null},{"source":"nvd","external_id":"CVE-2024-30040","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-30040","severity":null,"published_at":"2024-05-14T17:17:12+00:00","modified_at":"2026-06-17T07:26:06+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"}