modules:
  - module: github.com/microcosm-cc/bluemonday
    versions:
      - fixed: 1.0.16
    vulnerable_at: 1.0.15
    packages:
      - package: github.com/microcosm-cc/bluemonday
        symbols:
          - Policy.AllowElements
          - Policy.AllowElementsMatching
        derived_symbols:
          - Policy.AllowLists
          - Policy.AllowTables
          - UGCPolicy
description: |
    The bluemonday HTML sanitizer can leak the contents of a "style" element
    into HTML output, potentially causing XSS vulnerabilities.

    The default bluemonday sanitization policies are not vulnerable.
    Only user-defined policies allowing "select", "style", and
    "option" elements are affected.

    Permitting the "style" element in policies is hazardous, because bluemonday
    does not contain a CSS sanitizer. Newer versions of bluemonday suppress
    "style" and "script" elements even when allowed by a policy unless the
    policy explicitly requests unsafe processing.
published: 2022-08-15T18:02:24Z
cves:
  - CVE-2021-42576
ghsas:
  - GHSA-x95h-979x-cf3j
references:
  - fix: https://github.com/microcosm-cc/bluemonday/commit/c788a2a4d42e081ad54a31368478820bb4a42fb4
  - web: https://docs.google.com/document/d/11SoX296sMS0XoQiQbpxc5pNxSdbJKDJkm5BDv0zrX50/