CVE-2020-26293
HtmlSanitizer is a .NET library for cleaning HTML fragments and documents from constructs that can lead to XSS attacks.
Does this matter?
Lower severity and a low EPSS score (1.00%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 1.00% probability · 61th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-74, CWE-79
- Affected
- htmlsanitizer project/htmlsanitizer
- Source
- security-advisories@github.com
References
- https://github.com/mganss/HtmlSanitizer/commit/a3a7602a44d4155d51ec0fbbedc2a49e9c7e2eb8Patch, Third Party Advisory
- https://github.com/mganss/HtmlSanitizer/releases/tag/v5.0.372Release Notes, Third Party Advisory
- https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-8j9v-h2vp-2hhvThird Party Advisory
- https://www.nuget.org/packages/HtmlSanitizer/Product, Third Party Advisory
- https://github.com/mganss/HtmlSanitizer/commit/a3a7602a44d4155d51ec0fbbedc2a49e9c7e2eb8Patch, Third Party Advisory
- https://github.com/mganss/HtmlSanitizer/releases/tag/v5.0.372Release Notes, Third Party Advisory
- https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-8j9v-h2vp-2hhvThird Party Advisory
- https://www.nuget.org/packages/HtmlSanitizer/Product, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.