XWiki extension license information is public, exposing instance id and license holder details

Exploitation

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

CVSS

5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

• CVE-2024-26138: 0.49% estimated exploitation activity in the next 30 days; percentile 42.35 (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 licensor application includes the document Licenses.Code.LicenseJSON that provides information for admins regarding active licenses. This document is public and thus exposes this information publicly. The information includes the instance's id as well as first and last name and email of the license owner. This is a leak of information that isn't supposed to be public. The instance id allows associating data on the active installs data with the concrete XWiki instance. Active installs assures that "there's no way to find who's having a given UUID" (referring to the instance id). Further, the information who the license owner is and information about the obtained licenses can be used for targeted phishing attacks. Also, while user information is normally public, email addresses might only be displayed obfuscated (depending on the configuration). Patches This has been fixed in Application Licensing 1.24.2, by…

Published by the source

21 Feb 2024, 18:04 UTC

Last modified by the source

21 Mar 2026, 05:27 UTC

Source last checked

26 Oct 2026, 16:44 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-4hfp-m9gv-m753

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# Patch Next advisory brief: CVE-2024-26138

Advisory: XWiki extension license information is public, exposing instance id and license holder details
IDs: CVE-2024-26138, GHSA-4hfp-m9gv-m753
Record: https://patchnext.com/advisories/cve-2024-26138 (revision 1, source checked 26 Oct 2026, 16:44 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: com.xwiki.licensing:application-licensing-licensor-ui 1.24.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven com.xwiki.licensing:application-licensing-licensor-ui: affected >= 1.0, < 1.24.2; fixed in 1.24.2

## Suggested inspection (read-only)
- Maven com.xwiki.licensing:application-licensing-licensor-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 com.xwiki.licensing:application-licensing-licensor-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-4hfp-m9gv-m753 (GitHub-reviewed advisory GHSA-4hfp-m9gv-m753 lists affected ranges: Maven com.xwiki.licensing:application-licensing-licensor-ui >=1.0 <1.24.2)

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