XWiki allows remote code execution from account through macro descriptions and XWiki.XWikiSyntaxMacrosList

Exploitation

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

CVSS

9.9 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS

• CVE-2024-55877: 1.60% estimated exploitation activity in the next 30 days; percentile 75.86 (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 Any user with an account can perform arbitrary remote code execution by adding instances of XWiki.WikiMacroClass to any page. This compromises the confidentiality, integrity and availability of the whole XWiki installation. To reproduce on a instance, as a connected user without script nor programming rights, go to your user profile and add an object of type XWiki.WikiMacroClass. Set "Macro Id", "Macro Name" and "Macro Code" to any value, "Macro Visibility" to Current User and "Macro Description" to {{async}}{{groovy}}println("Hello from User macro!"){{/groovy}}{{/async}}. Save the page, then go to <host/xwiki/bin/view/XWiki/XWikiSyntaxMacrosList. If the description of your new macro reads "Hello from User macro!", then your instance is vulnerable. Patches This vulnerability has been fixed in XWiki 15.10.11, 16.4.1 and 16.5.0. Workarounds It is possible to manually apply this patch to the page XWiki.XWikiSyntaxMacrosList. References https://jira.xwiki.org/browse/XWIKI-22030…

Published by the source

12 Dec 2024, 19:21 UTC

Last modified by the source

30 Apr 2025, 20:39 UTC

Source last checked

26 Oct 2026, 16:35 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-2r87-74cx-2p7c

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# Patch Next advisory brief: CVE-2024-55877

Advisory: XWiki allows remote code execution from account through macro descriptions and XWiki.XWikiSyntaxMacrosList
IDs: CVE-2024-55877, GHSA-2r87-74cx-2p7c
Record: https://patchnext.com/advisories/cve-2024-55877 (revision 1, source checked 26 Oct 2026, 16:35 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.9)
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-help-ui 16.5.0, 16.4.1, 15.10.11. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.xwiki.platform:xwiki-platform-help-ui: affected >= 9.7-rc-1, < 15.10.11; >= 16.0.0-rc-1, < 16.4.1; >= 16.5.0-rc-1, < 16.5.0; fixed in 15.10.11, 16.4.1, 16.5.0

## Suggested inspection (read-only)
- Maven org.xwiki.platform:xwiki-platform-help-ui: 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-help-ui.
- 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-2r87-74cx-2p7c (GitHub-reviewed advisory GHSA-2r87-74cx-2p7c lists affected ranges: Maven org.xwiki.platform:xwiki-platform-help-ui >=9.7-rc-1 =16.0.0-rc-1 =16.5.0-rc-1 <16.5.0)

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