201 918
Advisory Published


First published: Mon Nov 20 2023(Updated: )

### 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 revision before/after adding the images. Whenever a user views that image, the user's login cookies should be sent to the attacker's server. The 101 images are to circumvent the cache that has a default maximum size of 100 entries. 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. ### Patches 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. ### Workarounds As a workaround, the image embedding feature can be disabled by deleting `xwiki-platform-diff-xml-<version>.jar` in `WEB-INF/lib/`. ### References * *

Affected SoftwareAffected VersionHow to fix

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Frequently Asked Questions

  • What is the severity of GHSA-7rfg-6273-f5wp vulnerability?

    The severity of GHSA-7rfg-6273-f5wp vulnerability is critical.

  • How does the rendered diff in XWiki embed images?

    The rendered diff in XWiki embeds images to compare the contents and not display a difference for an unchanged image.

  • Which version of XWiki platform is affected by GHSA-7rfg-6273-f5wp vulnerability?

    XWiki platform versions 15.6-rc-1 to 15.6, 15.0-rc-1 to 15.5.1, and 11.10.1 to 14.10.15 are affected by GHSA-7rfg-6273-f5wp vulnerability.

  • How can I fix GHSA-7rfg-6273-f5wp vulnerability?

    To fix GHSA-7rfg-6273-f5wp vulnerability, update your XWiki platform to version 15.6 or apply the appropriate security patches.

  • Is there any additional information available about GHSA-7rfg-6273-f5wp vulnerability?

    Yes, you can find additional information about GHSA-7rfg-6273-f5wp vulnerability in the provided reference links.


SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2023 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203