org.xwiki.rendering:xwiki-rendering-xml Improper Neutralization of Invalid Characters in Identifiers in Web Pages vulnerability

Exploitation

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

CVSS

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

EPSS

• CVE-2023-37908: 1.11% estimated exploitation activity in the next 30 days; percentile 66.01 (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 cleaning of attributes during XHTML rendering, introduced in version 14.6-rc-1, allowed the injection of arbitrary HTML code and thus cross-site scripting via invalid attribute names. This can be exploited, e.g., via the link syntax in any content that supports XWiki syntax like comments in XWiki: When a user moves the mouse over this link, the malicious JavaScript code is executed in the context of the user session. When this user is a privileged user who has programming rights, this allows server-side code execution with programming rights, impacting the confidentiality, integrity and availability of the XWiki instance. While this attribute was correctly recognized as not allowed, the attribute was still printed with a prefix data-xwiki-translated-attribute- without further cleaning or validation. Note that while versions below 14.6 are not vulnerable to this particular vulnerability, they are still vulnerable to XSS through attributes in XWiki syntax, see the…

Published by the source

25 Oct 2023, 21:02 UTC

Last modified by the source

10 Nov 2023, 05:04 UTC

Source last checked

26 Oct 2026, 16:17 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-663w-2xp3-5739

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# Patch Next advisory brief: CVE-2023-37908

Advisory: org.xwiki.rendering:xwiki-rendering-xml Improper Neutralization of Invalid Characters in Identifiers in Web Pages vulnerability
IDs: CVE-2023-37908, GHSA-663w-2xp3-5739
Record: https://patchnext.com/advisories/cve-2023-37908 (revision 1, source checked 26 Oct 2026, 16:17 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.xwiki.rendering:xwiki-rendering-xml 14.10.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.xwiki.rendering:xwiki-rendering-xml: affected >= 14.6-rc-1, < 14.10.4; fixed in 14.10.4

## Suggested inspection (read-only)
- Maven org.xwiki.rendering:xwiki-rendering-xml: 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.rendering:xwiki-rendering-xml.
- 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-663w-2xp3-5739 (GitHub-reviewed advisory GHSA-663w-2xp3-5739 lists affected ranges: Maven org.xwiki.rendering:xwiki-rendering-xml >=14.6-rc-1 <14.10.4)

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