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CVE-2020-6802: Cross-site Scripting

February 24, 2020 (updated September 13, 2024)

In Mozilla Bleach, a mutation XSS affects users calling bleach.clean with noscript.

References

  • advisory.checkmarx.net/advisory/CX-2020-4276
  • bugzilla.mozilla.org/show_bug.cgi?id=1615315
  • cure53.de/fp170.pdf
  • github.com/advisories/GHSA-q65m-pv3f-wr5r
  • github.com/mozilla/bleach
  • github.com/mozilla/bleach/commit/f77e0f6392177a06e46a49abd61a4d9f035e57fd
  • github.com/mozilla/bleach/security/advisories/GHSA-q65m-pv3f-wr5r
  • github.com/pypa/advisory-database/tree/main/vulns/bleach/PYSEC-2020-27.yaml
  • lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/72R4VFFHDRSQMNT7IZU3X2755ZP4HGNI
  • lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OCNLM2MGQTOLCIVVYS2Z5S7KOQJR5JC4
  • lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YTULPQB7HVPPYWEYVNHJGDTSPVIDHIZX
  • nvd.nist.gov/vuln/detail/CVE-2020-6802
  • www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach

Code Behaviors & Features

Detect and mitigate CVE-2020-6802 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →

Affected versions

All versions before 3.1.1

Fixed versions

  • 3.1.1

Solution

Upgrade to version 3.1.1 or above.

Impact 6.1 MEDIUM

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

Learn more about CVSS

Weakness

  • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Source file

pypi/bleach/CVE-2020-6802.yml

Spotted a mistake? Edit the file on GitLab.

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