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bdu:2025-05355

EUVD-2026-236094

fkie_cve-2025-46557

XWiki is a generic wiki platform. In versions starting from 15.3-rc-1 to before 15.10.14, from 16.0.0-rc-1 to before 16.4.6, and from 16.5.0-rc-1 to before 16.10.0-rc-1, a user who can access pages located in the XWiki space (by default, anyone) can access the page XWiki.Authentication.Administration and (unless an authenticator is set in xwiki.cfg) switch to another installed authenticator. Note that, by default, there is only one authenticator available (Standard XWiki Authenticator). So, if no authenticator extension was installed, it's not really possible to do anything for an attacker. Also, in most cases, if an SSO authenticator is installed and utilized (like OIDC or LDAP for example), the worst an attacker can do is break authentication by switching back to the standard authenticator (that's because it's impossible to login to a user which does not have a stored password, and that's usually what SSO authenticator produce). This issue has been patched in versions 15.10.14, 16.4.6, and 16.10.0-rc-1.

GHSA-f9c6-2f9p-82jj — Any user with view access to the XWiki space can change the authenticator

Affected: Maven: org.xwiki.platform:xwiki-platform-security-authentication-ui

### Impact

A user who can access pages located in the XWiki space (by default, anyone) can access the page `XWiki.Authentication.Administration` and (unless an authenticator is set in `xwiki.cfg`) switch to another installed authenticator.

Note that, by default, there is only one authenticator available (`Standard XWiki Authenticator`). So, if no authenticator extension was installed, it's not really possible to do anything for an attacker.

Also, in most cases, if you have installed and are using an SSO authenticator (like OIDC or LDAP for example), the worst an attacker can do is break authentication by switching back to the standard authenticator (that's because it's impossible to login to a user which does not have a stored password, and that's usually what SSO authenticator produce).

### Patches

This has been patched in XWiki 15.10.9 and XWiki 16.3.0RC1.

### Workarounds

You can very easily fix this vulnerability in your instance through right configuration: * access the page and children right administration of the page `XWiki.Authentication` (`https://myhost/xwiki/bin/admin/XWiki/Authentication/WebPreferences?editor=spaceadmin&section=PageAndChildrenRights&space=XWiki.Authentication#|t=usersandgroupstable&p=1&l=10&uorg=groups&wiki=local&clsname=XWiki.XWikiGlobalRights`) * make sure only admin user have the VIEW right

### References

https://jira.xwiki.org/browse/XWIKI-22604 https://github.com/xwiki/xwiki-platform/commit/5efc31cea1501c9a5cb593566fea8b558ff32a2a…

WID-SEC-W-2025-0907 — xwiki: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in xwiki ausnutzen, um Sicherheitsvorkehrungen zu umgehen.