CVE-2021-21379: XWiki

Medium severity, CVSS 5.4. EPSS: 0.5% chance of exploitation in the next 30 days.

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. In affected versions of XWiki Platform, the `{{wikimacrocontent}}` executes the content with the rights of the wiki macro author instead of the caller of that wiki macro. This makes possible to inject scripts through it and they will be executed with the rights of the wiki macro (very often a user which has Programming rights). Fortunately, no such macro exists by default in XWiki Standard but one could have been created or installed with an extension. This vulnerability has been patched in versions XWiki 12.6.3, 11.10.11 and 12.8-rc-1. There is no easy workaround other than disabling the affected macros. Inserting content in a safe way or knowing what is the user who called the wiki macro is not easy.

Affected products

• XWiki XWiki: from 11.4, before 11.10.11 (fixed in 11.10.11); from 12.0, before 12.6.3 (fixed in 12.6.3); from 12.7, up to and including 12.7.1

Published 2021-03-12. Last modified 2026-06-17.