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

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

not scored

EPSS

• CVE-2021-21379: 0.48% estimated exploitation activity in the next 30 days; percentile 41.14 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact 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. Patches It has been patched in versions XWiki 12.6.3, 11.10.11 and 12.8-rc-1. Workarounds 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. References https://jira.xwiki.org/browse/XWIKI-17759 For more information If you have any questions or comments about this advisory: Open an issue in Jira XWiki Email us at our security mailing list

Published by the source

23 Mar 2021, 22:47 UTC

Last modified by the source

1 Feb 2023, 05:05 UTC

Source last checked

26 Oct 2026, 16:06 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-v662-xpcc-9xf6

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# Patch Next advisory brief: CVE-2021-21379

Advisory: It's possible to execute anything with the rights of the author of a macro which uses the {{wikimacrocontent}} macro
IDs: CVE-2021-21379, GHSA-v662-xpcc-9xf6
Record: https://patchnext.com/advisories/cve-2021-21379 (revision 1, source checked 26 Oct 2026, 16:06 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.xwiki.platform:xwiki-platform-rendering-wikimacro-store 12.8, 12.6.3, 11.10.11. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.xwiki.platform:xwiki-platform-rendering-wikimacro-store: affected >= 11.4, < 11.10.11; >= 12.0, < 12.6.3; >= 12.7, <= 12.7.1; fixed in 12.6.3, 11.10.11, 12.8

## Suggested inspection (read-only)
- Maven org.xwiki.platform:xwiki-platform-rendering-wikimacro-store: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.xwiki.platform:xwiki-platform-rendering-wikimacro-store.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-v662-xpcc-9xf6 (GitHub-reviewed advisory GHSA-v662-xpcc-9xf6 lists affected ranges: Maven org.xwiki.platform:xwiki-platform-rendering-wikimacro-store >=11.4 =12.0 =12.7 <=12.7.1)

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