Ecosyste.ms: Advisories

Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLThqOXYtaDJ2cC0yaGh2

XSS in HtmlSanitizer

Impact

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.

Patches

The problem has been fixed in version 5.0.372.

Workarounds

Remove the <style> tag from the set of allowed tags.

For more information

If you have any questions or comments about this advisory open an issue in https://github.com/mganss/HtmlSanitizer

Credits

This issue was discovered by Michal Bentkowski of Securitum.

Permalink: https://github.com/advisories/GHSA-8j9v-h2vp-2hhv
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLThqOXYtaDJ2cC0yaGh2
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Low
Classification: General
Published: over 3 years ago
Updated: about 1 year ago

CVSS Score: 6.1
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N

Identifiers: GHSA-8j9v-h2vp-2hhv, CVE-2020-26293
References:

• https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-8j9v-h2vp-2hhv
• https://github.com/mganss/HtmlSanitizer/releases/tag/v5.0.372
• https://www.nuget.org/packages/HtmlSanitizer/
• https://nvd.nist.gov/vuln/detail/CVE-2020-26293
• https://github.com/mganss/HtmlSanitizer/commit/a3a7602a44d4155d51ec0fbbedc2a49e9c7e2eb8
• https://github.com/advisories/GHSA-8j9v-h2vp-2hhv

Repository: https://github.com/mganss/HtmlSanitizer
Blast Radius: 1.0

Affected Packages