Cross-Site Request Forgery in xwiki-platform

Summary

Impact It's possible to know if a user has or not an account in a wiki related to an email address, and which username(s) is actually tied to that email by forging a request to the Forgot username page. Note that since this page does not have a CSRF check it's quite easy to perform a lot of those requests. ### Patches This issue has been patched in XWiki 12.10.5 and 13.2RC1. Two different patches are provided: - a first one to fix the CSRF problem - a more complex one that now relies on sending an email for the Forgot username process. ### Workarounds It's possible to fix the problem without uprading by editing the ForgotUsername page in version below 13.x, to use the following code: https://github.com/xwiki/xwiki-platform/blob/69548c0320cbd772540cf4668743e69f879812cf/xwiki-platform-core/xwiki-platform-administration/xwiki-platform-administration-ui/src/main/resources/XWiki/ForgotUsername.xml#L39-L123 In version after 13.x it's also possible to edit manually the forgotusername.vm file, but it's really encouraged to upgrade the version here. ### References * https://jira.xwiki.org/browse/XWIKI-18384 * https://jira.xwiki.org/browse/XWIKI-18408 ### For more information If you have any questions or comments about this advisory: * Open an issue in Jira XWiki * Email us at security ML

Timeline

1. Feb 4, 2022, 10:15 PM UTCCVE published
2. Apr 22, 2025, 3:42 PM UTCCISA SSVC assessment

   Exploitation: poc · Automatable: yes · Technical impact: partial

3. Apr 22, 2025, 6:27 PM UTCRecord last updated

Affected versions

• xwiki xwiki-platform

  fixed in 12.10.5; From 13.0 · fixed in 13.2RC1

• org.xwiki.platform:xwiki-platform-administration-uiMaven

  fixed in 12.10.5

• org.xwiki.platform:xwiki-platform-administration-uiMaven

  From 13.0 · fixed in 13.2RC1

References 5