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XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. Versions 10.4-rc-1, through 16.10.15, 17.0.0-rc-1, through 17.4.7 and 17.5.0-rc-1 through 17.10.0 contain a reflected cross-site scripting vulnerability (XSS) in the comparison view between revisions of a page allows executing JavaScript code in the user's browser. If the current user is an admin, this can not only affect the current user but also the confidentiality, integrity and availability of the whole XWiki instance. If developers are unable to update immediately, they can apply the patch manually to templates/changesdoc.vm in the deployed WAR.
Use CWE-80, Xwiki vendor hub and Xwiki product page to widen CVE-2026-40105 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.