XWiki Platform vulnerable to data leak via Improper Restriction of XML External Entity Reference

Exploitation

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

CVSS

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

EPSS

• CVE-2023-27480: 0.75% estimated exploitation activity in the next 30 days; percentile 54.86 (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 edit rights on a document can trigger a XAR import on a forged XAR file, leading to the ability to display the content of any file on the XWiki server host. Example to reproduce: Create a forget XAR file and inside it, have the following package.xml content: Upload it onto a wiki page (e.g. XXE) as an attachment (e.g. test.xar). Call the page using http://localhost:8080/xwiki/bin/view/Main/XXE?sheet=XWiki.AdminImportSheet&file=test.xar You'll then notice that the displayed UI contains the content of the /etc/passwd file. Patches The vulnerability has been patched in XWiki 13.10.11, 14.4.7 and 14.10-rc-1. Workarounds You'd need to get XWiki Platform sources and apply the changes from https://github.com/xwiki/xwiki-platform/commit/e3527b98fdd8dc8179c24dc55e662b2c55199434 to the XarPackage java class and then copy the modified version to your WEB-INF/classes directory (or rebuild the xwiki-platform-xar-model maven module and replace the one found in WEB-INF/lib/).…

Published by the source

8 Mar 2023, 17:19 UTC

Last modified by the source

8 Mar 2023, 17:19 UTC

Source last checked

26 Oct 2026, 16:11 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-gx4f-976g-7g6v

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# Patch Next advisory brief: CVE-2023-27480

Advisory: XWiki Platform vulnerable to data leak via Improper Restriction of XML External Entity Reference
IDs: CVE-2023-27480, GHSA-gx4f-976g-7g6v
Record: https://patchnext.com/advisories/cve-2023-27480 (revision 1, source checked 26 Oct 2026, 16:11 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.7)
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-xar-model 14.10-rc-1, 14.4.7, 13.10.11. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.xwiki.platform:xwiki-platform-xar-model: affected >= 1.1-milestone-3, < 13.10.11; >= 14.0, < 14.4.7; >= 14.5, < 14.10-rc-1; fixed in 14.4.7, 13.10.11, 14.10-rc-1

## Suggested inspection (read-only)
- Maven org.xwiki.platform:xwiki-platform-xar-model: 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-xar-model.
- 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-gx4f-976g-7g6v (GitHub-reviewed advisory GHSA-gx4f-976g-7g6v lists affected ranges: Maven org.xwiki.platform:xwiki-platform-xar-model >=1.1-milestone-3 =14.0 =14.5 <14.10-rc-1)

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