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XWiki Contrib's Syntax Markdown allows importing Markdown content into wiki pages and creating wiki content in Markdown. In versions starting from 8.2 to before 8.9, the Markdown syntax is vulnerable to cross-site scripting (XSS) through HTML. In particular, using Markdown syntax, it's possible for any user to embed Javascript code that will then be executed on the browser of any other user visiting either the document or the comment that contains it. In the instance that this code is executed by a user with admins or programming rights, this issue compromises the confidentiality, integrity and availability of the whole XWiki installation. This issue has been patched in version 8.9.
Use CWE-79, Xwiki vendor hub and Xwiki product page to widen CVE-2025-46558 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2025-55748, CVE-2025-55747 and CVE-2025-51991 for nearby disclosures in the same product family.