CVE-2020-26870: Cross-site Scripting

October 7, 2020 (updated July 20, 2021)

Cure53 DOMPurify allows mutation XSS. This occurs because a serialize-parse roundtrip does not necessarily return the original DOM tree, and a namespace can change from HTML to MathML, as demonstrated by nesting of FORM elements.

References

nvd.nist.gov/vuln/detail/CVE-2020-26870
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-26870

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