Cookies are sent to external images in rendered diff (and server side request forgery)

Exploitation

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

CVSS

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

EPSS

• CVE-2023-48240: 0.71% estimated exploitation activity in the next 30 days; percentile 53.57 (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 rendered diff in XWiki embeds images to be able to compare the contents and not display a difference for an actually unchanged image. For this, XWiki requests all embedded images on the server side. These requests are also sent for images from other domains and include all cookies that were sent in the original request to ensure that images with restricted view right can be compared. This allows an attacker to steal login and session cookies that allow impersonating the current user who views the diff. The attack can be triggered with an image that references the rendered diff, thus making it easy to trigger. More concretely, to reproduce, add 101 different images with references to the attacker's server. In any place add an image with a reference to /xwiki/bin/view/Image%20Cookie%20Test/?xpage=changes&rev1=1.1&rev2=2.1&include=renderedChanges where Image%20Cookie%20Test needs to be replaced by the path to the document with the images and the two revisions should match the…

Published by the source

20 Nov 2023, 21:00 UTC

Last modified by the source

29 Nov 2023, 21:48 UTC

Source last checked

26 Oct 2026, 16:20 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-7rfg-6273-f5wp

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# Patch Next advisory brief: CVE-2023-48240

Advisory: Cookies are sent to external images in rendered diff (and server side request forgery)
IDs: CVE-2023-48240, GHSA-7rfg-6273-f5wp
Record: https://patchnext.com/advisories/cve-2023-48240 (revision 1, source checked 26 Oct 2026, 16:20 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.0)
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-diff-xml 15.6, 15.5.1, 14.10.15. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.xwiki.platform:xwiki-platform-diff-xml: affected >= 11.10.1, < 14.10.15; >= 15.0-rc-1, < 15.5.1; >= 15.6-rc-1, < 15.6; fixed in 14.10.15, 15.6, 15.5.1

## Suggested inspection (read-only)
- Maven org.xwiki.platform:xwiki-platform-diff-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.platform:xwiki-platform-diff-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-7rfg-6273-f5wp (GitHub-reviewed advisory GHSA-7rfg-6273-f5wp lists affected ranges: Maven org.xwiki.platform:xwiki-platform-diff-xml >=11.10.1 =15.0-rc-1 =15.6-rc-1 <15.6)

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