{"id":"CVE-2020-26293","state":"PUBLISHED","title":"Possible XSS bypass if style tag is allowed","description":"HtmlSanitizer is a .NET library for cleaning HTML fragments and documents from constructs that can lead to XSS attacks. In HtmlSanitizer before version 5.0.372, there is a possible XSS bypass if style tag is allowed. If you have explicitly allowed the `<style>` tag, an attacker could craft HTML that includes script after passing through the sanitizer. The default settings disallow the `<style>` tag so there is no risk if you have not explicitly allowed the `<style>` tag. The problem has been fixed in version 5.0.372.","publishedAt":"2021-01-04T18:20:14.000Z","updatedAt":"2024-08-04T15:56:03.977Z","severity":{"score":6.1,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["mganss HtmlSanitizer"],"affected":[{"vendor":"mganss","product":"HtmlSanitizer","versions":[{"version":"< 5.0.372","status":"affected"}]}],"references":["https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-8j9v-h2vp-2hhv","https://www.nuget.org/packages/HtmlSanitizer/","https://github.com/mganss/HtmlSanitizer/releases/tag/v5.0.372","https://github.com/mganss/HtmlSanitizer/commit/a3a7602a44d4155d51ec0fbbedc2a49e9c7e2eb8"],"weaknesses":["CWE-74"],"ingestedAt":"2026-10-29T19:47:08.370Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2020/26xxx/CVE-2020-26293.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2020-26293","state":"PUBLISHED","datePublished":"2021-01-04T18:20:14.000Z","dateUpdated":"2024-08-04T15:56:03.977Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2020-10-01T00:00:00.000Z"},"containers":{"cna":{"title":"Possible XSS bypass if style tag is allowed","descriptions":[{"lang":"en","value":"HtmlSanitizer is a .NET library for cleaning HTML fragments and documents from constructs that can lead to XSS attacks. In HtmlSanitizer before version 5.0.372, there is a possible XSS bypass if style tag is allowed. If you have explicitly allowed the `<style>` tag, an attacker could craft HTML that includes script after passing through the sanitizer. The default settings disallow the `<style>` tag so there is no risk if you have not explicitly allowed the `<style>` tag. 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