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Input Validation\nA spoofing vulnerability exists when the ASP.NET Core fails to properly sanitize web requests.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2017-0256","reference_id":"","reference_type":"","scores":[{"value":"0.04349","scoring_system":"epss","scoring_elements":"0.88977","published_at":"2026-04-29T12:55:00Z"},{"value":"0.04349","scoring_system":"epss","scoring_elements":"0.88952","published_at":"2026-04-11T12:55:00Z"},{"value":"0.04349","scoring_system":"epss","scoring_elements":"0.88946","published_at":"2026-04-12T12:55:00Z"},{"value":"0.04349","scoring_system":"epss","scoring_elements":"0.88945","published_at":"2026-04-13T12:55:00Z"},{"value":"0.04349","scoring_system":"epss","scoring_elements":"0.88958","published_at":"2026-04-16T12:55:00Z"},{"value":"0.04349","scoring_system":"epss","scoring_elements":"0.88956","published_at":"2026-04-18T12:55:00Z"},{"value":"0.04349","scoring_system":"epss","scoring_elements":"0.88953","published_at":"2026-04-21T12:55:00Z"},{"value":"0.04349","scoring_system":"epss","scoring_elements":"0.8897","published_at":"2026-04-24T12:55:00Z"},{"value":"0.04349","scoring_system":"epss","scoring_elements":"0.8889","published_at":"2026-04-01T12:55:00Z"},{"value":"0.04349","scoring_system":"epss","scoring_elements":"0.88899","published_at":"2026-04-02T12:55:00Z"},{"value":"0.04349","scoring_system":"epss","scoring_elements":"0.88915","published_at":"2026-04-04T12:55:00Z"},{"value":"0.04349","scoring_system":"epss","scoring_elements":"0.88917","published_at":"2026-04-07T12:55:00Z"},{"value":"0.04349","scoring_system":"epss","scoring_elements":"0.88935","published_at":"2026-04-08T12:55:00Z"},{"value":"0.04349","scoring_system":"epss","scoring_elements":"0.8894","published_at":"2026-04-09T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2017-0256"},{"reference_url":"https://github.com/aspnet/Announcements/issues/239","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/aspnet/Announcements/issues/239"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2017-0256","reference_id":"CVE-2017-0256","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2017-0256"},{"reference_url":"https://github.com/advisories/GHSA-j8f4-2w4p-mhjc","reference_id":"GHSA-j8f4-2w4p-mhjc","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-j8f4-2w4p-mhjc"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/1599?format=json","purl":"pkg:nuget/Microsoft.AspNetCore.Mvc.Core@1.0.4","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-bmf7-rsbm-3fb1"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:nuget/Microsoft.AspNetCore.Mvc.Core@1.0.4"},{"url":"http://public2.vulnerablecode.io/api/packages/1605?format=json","purl":"pkg:nuget/Microsoft.AspNetCore.Mvc.Core@1.1.3","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-bmf7-rsbm-3fb1"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:nuget/Microsoft.AspNetCore.Mvc.Core@1.1.3"}],"aliases":["CVE-2017-0256","GHSA-j8f4-2w4p-mhjc"],"risk_score":3.1,"exploitability":"0.5","weighted_severity":"6.2","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-b2mg-kc6t-z7ht"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/5152?format=json","vulnerability_id":"VCID-bmf7-rsbm-3fb1","summary":"Microsoft Security Advisory CVE-2017-8700: CORS bypass can enable Information 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