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Plone through 5.2.4 allows XSS via the inline_diff methods in Products.CMFDiffTool.
Use CWE-79, Plone vendor hub and Plone product page to widen CVE-2021-33513 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2021-33509, CVE-2021-33926 and CVE-2024-22889 for nearby disclosures in the same product family.