{"id":"CVE-2008-3843","url":"https://www.cyber-defence.io/tools/cve/CVE-2008-3843","generatedAt":"2026-10-27T19:56:26.101Z","title":"Request Validation (aka the ValidateRequest filters) in ASP.NET in Microsoft .NET Framework with the MS07-040 update does not properly detect dangerous client input, which allows remote attackers to conduct cross-site scripting (XSS) attacks, as…","description":"Request Validation (aka the ValidateRequest filters) in ASP.NET in Microsoft .NET Framework with the MS07-040 update does not properly detect dangerous client input, which allows remote attackers to conduct cross-site scripting (XSS) attacks, as demonstrated by a query string containing a \"<~/\" (less-than tilde slash) sequence followed by a crafted STYLE element.","published":"2008-08-27T20:41:00.000Z","lastModified":"2026-06-16T22:56:39.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"2.0","score":4.3,"severity":"MEDIUM","vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N"},"cwe":["CWE-79"],"affected":["microsoft/.net framework"],"epss":{"score":0.21991,"percentile":0.97643,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 22.0%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://securityreason.com/securityalert/4193","source":"cve@mitre.org"},{"url":"http://www.procheckup.com/PDFs/bypassing-dot-NET-ValidateRequest.pdf","source":"cve@mitre.org"},{"url":"http://www.procheckup.com/Vulnerability_PR08-20.php","source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/archive/1/495667/100/0/threaded","source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/archive/1/496071/100/0/threaded","source":"cve@mitre.org"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/44743","source":"cve@mitre.org"},{"url":"http://securityreason.com/securityalert/4193","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.procheckup.com/PDFs/bypassing-dot-NET-ValidateRequest.pdf","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.procheckup.com/Vulnerability_PR08-20.php","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/archive/1/495667/100/0/threaded","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/archive/1/496071/100/0/threaded","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/44743","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2008-3843","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}