CVE-2021-21379 It's possible to execute anything with the rights of the author of a macro which uses the {{wikimacrocontent}} macro

What is CVE-2021-21379?

CVE-2021-21379 is a high-severity vulnerability in Xwiki Xwiki, published on 12 Mar 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

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.

Weakness: CWE-281

Which versions are affected by CVE-2021-21379?

6 open source packages ship an affected version, including org.xwiki.platform:xwiki-platform-rendering-wikimacro-store. It affects 1 product.

Products include Xwiki Xwiki.

How do I fix CVE-2021-21379?

Upgrade org.xwiki.platform:xwiki-platform-rendering-wikimacro-store to a fixed version for your release line: 11.10.11, 12.6.3 or 12.8.

Is CVE-2021-21379 being exploited?

There is no known exploitation of CVE-2021-21379 in the wild and no public exploit code.

Other vulnerabilities in Xwiki Xwiki

• CVE-2025-24893 XWiki Platform Eval Injection Exploited Critical 9.8
• CVE-2025-53836 XWiki Rendering is vulnerable to RCE attacks when processing nested macros Critical 10.0
• CVE-2024-55662 XWiki allows remote code execution through the extension sheet Critical 10.0
• CVE-2024-55877 XWiki allows remote code execution from account through macro descriptions and XWiki.XWikiSyntaxMacrosList Critical 10.0
• CVE-2024-37901 XWiki Platform vulnerable to remote code execution from account via SearchSuggestConfigSheet Critical 10.0

All Xwiki Xwiki vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-v662-xpcc-9xf6.