CVE-2020-26293

MEDIUM EPSS 58.3%
Published Jan 4, 20215y ago · Modified Jun 17, 20262w ago
6.1 CVSS 3.1
Medium
Find Similar
Published Jan 4, 2021 5y ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
6.1
Exploitability
2.8
Impact
2.7
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Changed
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
58.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-74
CWE-79 Cross-site Scripting Injection

Affected Products 1

VendorProductVersionRange
htmlsanitizer_projecthtmlsanitizer* <5.0.372

References 4

  • github.com https://github.com/mganss/HtmlSanitizer/commit/a3a7602a44d4155d51ec0fbbedc2a49e9c7e2eb8
    PatchThird Party Advisory
  • github.com https://github.com/mganss/HtmlSanitizer/releases/tag/v5.0.372
    Release NotesThird Party Advisory
  • github.com https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-8j9v-h2vp-2hhv
    Third Party Advisory
  • nuget.org https://www.nuget.org/packages/HtmlSanitizer/
    ProductThird Party Advisory

Remediation

  • github.com https://github.com/mganss/HtmlSanitizer/commit/a3a7602a44d4155d51ec0fbbedc2a49e9c7e2eb8
    PatchThird Party Advisory