Cross-site scripting via leaked style elements in github.com/microcosm-cc/bluemonday
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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2021-42576US | critical9.8 | — | ||
The bluemonday sanitizer before 1.0.16 for Go, and before 0.0.8 for Python (in pybluemonday), does not properly enforce policies associated with the SELECT, STYLE, and OPTION eleme… | ||||
references
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