XWiki Platform vulnerable to reflected cross-site scripting via xredirect parameter in delete template

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-2023-35156: 2.08% estimated exploitation activity in the next 30 days; percentile 81.55 (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 Users are able to forge an URL with a payload allowing to inject Javascript in the page (XSS). It's possible to exploit the delete template to perform a XSS, e.g. by using URL such as: xwiki/bin/get/FlamingoThemes/Cerulean?xpage=xpart&vm=delete.vm&xredirect=javascript:alert(document.domain) This vulnerability exists since XWiki 6.0-rc-1. Patches The vulnerability has been patched in XWiki 14.10.6 and 15.1. Note that a partial patch has been provided in 14.10.5 but wasn't enough to entirely fix the vulnerability. Workarounds It's possible to workaround the vulnerability by editing the template delete.vm to perform checks on it, but note that the appropriate fix involves new APIs that have been recently introduced in XWiki. See the referenced jira tickets. References Jira ticket about the original vulnerability: https://jira.xwiki.org/browse/XWIKI-20341 Commit containing the first fix in the template:…

Published by the source

22 Jun 2023, 19:59 UTC

Last modified by the source

12 Nov 2023, 05:04 UTC

Source last checked

26 Oct 2026, 16:19 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-834c-x29c-f42c

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# Patch Next advisory brief: CVE-2023-35156

Advisory: XWiki Platform vulnerable to reflected cross-site scripting via xredirect parameter in delete template
IDs: CVE-2023-35156, GHSA-834c-x29c-f42c
Record: https://patchnext.com/advisories/cve-2023-35156 (revision 1, source checked 26 Oct 2026, 16:19 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.platform:xwiki-platform-flamingo-skin-resources 15.1, 14.10.6. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.xwiki.platform:xwiki-platform-flamingo-skin-resources: affected >= 6.0-rc-1, < 14.10.6; >= 15.0-rc-0, < 15.1; fixed in 15.1, 14.10.6

## Suggested inspection (read-only)
- Maven org.xwiki.platform:xwiki-platform-flamingo-skin-resources: 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-flamingo-skin-resources.
- 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-834c-x29c-f42c (GitHub-reviewed advisory GHSA-834c-x29c-f42c lists affected ranges: Maven org.xwiki.platform:xwiki-platform-flamingo-skin-resources >=6.0-rc-1 =15.0-rc-0 <15.1)

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