XSS in Htmlsanitizer Project
CVE-2020-26293
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.010 (61.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: +0.000
Affected products
- Htmlsanitizer Project
- Mganss Htmlsanitizer — versions < 5.0.372
Weakness classification (CWE)
References
- github.com/mganss/HtmlSanitizer/security/advisories/GHSA-8j9v-h2vp-2hhv (Third Party Advisory)
- www.nuget.org/packages/HtmlSanitizer/ (Product, Third Party Advisory)
- github.com/mganss/HtmlSanitizer/releases/tag/v5.0.372 (Third Party Advisory, Release Notes)
- github.com/mganss/HtmlSanitizer/commit/a3a7602a44d4155d51ec0fbbedc2a49e9c7e2eb8 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-26293?
- CVE-2020-26293 is a medium-severity vulnerability in Htmlsanitizer Project, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.1/10. Published 2021-01-04.
- How severe is CVE-2020-26293?
- Medium severity. CVSS v3 base score is 6.1 out of 10.