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Advisory Published
Advisory Published

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

First published: Mon Nov 20 2023(Updated: )

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/`.


Affected SoftwareAffected VersionHow to fix
Xwiki Xwiki>=11.10.1<14.10.15
Xwiki Xwiki>=15.0<15.5.1
Xwiki Xwiki=15.6-rc1

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Frequently Asked Questions

  • What is the impact of CVE-2023-48240?

    The impact of CVE-2023-48240 is that the rendered diff in XWiki embeds images from other domains and sends cookies, which can result in unauthorized access or information leakage.

  • How does CVE-2023-48240 affect XWiki?

    CVE-2023-48240 affects XWiki by allowing images from other domains to be embedded in the rendered diff, which can lead to security vulnerabilities.

  • What is the severity of CVE-2023-48240?

    The severity of CVE-2023-48240 is critical with a CVSS score of 9.1.

  • Which versions of XWiki are affected by CVE-2023-48240?

    Versions 11.10.1 to 15.6-rc-1 of XWiki are affected by CVE-2023-48240.

  • How can CVE-2023-48240 be fixed?

    To fix CVE-2023-48240, users should upgrade to XWiki version 15.6 or apply the appropriate security patches mentioned in the XWiki advisory.


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