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Critical, CVSS 9.4

XWiki Platform allows XSS through XClass name in string properties

CVE-2024-43400GHSA-wcg9-pgqv-xm5v

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.xwiki.platform:xwiki-platform-oldcore 16.0.0, 15.10.6, 15.5.5, 14.10.21), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

  • GitHub Advisory Database and maintainer security advisories on GitHub

    GitHub-reviewed advisory GHSA-wcg9-pgqv-xm5v lists affected ranges: Maven org.xwiki.platform:xwiki-platform-oldcore >=1.1.2 =15.0-rc-1 =15.6-rc-1 =16.0.0-rc-1 <=16.0.0-rc-1

    VerifiedObserved Structured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
9.4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H · score source
EPSS
  • CVE-2024-43400: 0.49% estimated exploitation activity in the next 30 days; percentile 42.09 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact Is it possible for a user without Script or Programming rights to craft a URL pointing to a page with arbitrary JavaScript. This requires social engineer to trick a user to follow the URL. Reproduction steps 1. As a user without script or programming right, create a (non-terminal) document named " + alert(1) + " (the quotes need to be part of the name). 1. Edit the class. 1. Add a string property named "test". 1. Edit using the object editor and add an object of the created class 1. Get an admin to open <xwiki-server/xwiki/bin/view/%22%20%2B%20alert(1)%20%2B%20%22/?viewer=display&type=object&property=%22%20%2B%20alert(1)%20%2B%20%22.WebHome.test&mode=edit where <xwiki-server is the URL of your XWiki installation. Patches This has been patched in XWiki 14.10.21, 15.5.5, 15.10.6 and 16.0.0. Workarounds We're not aware of any workaround except upgrading. References - https://jira.xwiki.org/browse/XWIKI-21810 -…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-wcg9-pgqv-xm5v

Agent brief

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# Patch Next advisory brief: CVE-2024-43400

Advisory: XWiki Platform allows XSS through XClass name in string properties
IDs: CVE-2024-43400, GHSA-wcg9-pgqv-xm5v
Record: https://patchnext.com/advisories/cve-2024-43400 (revision 1, source checked 26 Oct 2026, 16:30 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.4)
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-oldcore 16.0.0, 15.10.6, 15.5.5, 14.10.21. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.xwiki.platform:xwiki-platform-oldcore: affected >= 1.1.2, < 14.10.21; >= 15.0-rc-1, < 15.5.5; >= 15.6-rc-1, < 15.10.6; >= 16.0.0-rc-1, <= 16.0.0-rc-1; fixed in 14.10.21, 15.10.6, 15.5.5, 16.0.0

## Suggested inspection (read-only)
- Maven org.xwiki.platform:xwiki-platform-oldcore: 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-oldcore.
- 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-wcg9-pgqv-xm5v (GitHub-reviewed advisory GHSA-wcg9-pgqv-xm5v lists affected ranges: Maven org.xwiki.platform:xwiki-platform-oldcore >=1.1.2 =15.0-rc-1 =15.6-rc-1 =16.0.0-rc-1 <=16.0.0-rc-1)

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