CVE-2020-26293 Possible XSS bypass if style tag is allowed

2021-01-0418:20:14

CWE-74

GitHub_M

www.cve.org

6.1 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N

0.001 Low

EPSS

Percentile

46.4%

JSON

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.

CNA Affected

[
  {
    "product": "HtmlSanitizer",
    "vendor": "mganss",
    "versions": [
      {
        "status": "affected",
        "version": "< 5.0.372"
      }
    ]
  }
]