{"cve":"CVE-2008-3842","nvd":{"published":"2008-08-27T20:41:00.000","modified":"2026-06-16T22:56:39.077","status":"Modified","description":"Request Validation (aka the ValidateRequest filters) in ASP.NET in Microsoft .NET Framework without 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 slash) sequence.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-79"],"references":["http://securityreason.com/securityalert/4193","http://www.procheckup.com/PDFs/bypassing-dot-NET-ValidateRequest.pdf","http://www.securityfocus.com/archive/1/495667/100/0/threaded","https://exchange.xforce.ibmcloud.com/vulnerabilities/44741","http://securityreason.com/securityalert/4193"],"products":["microsoft:.net_framework"],"source":"nvd","synced_at":"2026-10-19T19:52:44.811608366+00:00"},"epss":{"cve":"CVE-2008-3842","score":0.20421,"percentile":0.97495,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}