CVE-2026-43975: Apache Wicket: Possible malicious path traversal in FolderUploadsFileManager

[Pedro Henrique Oliveira dos Santos <pedro () apache org>]

Severity: critical 

Affected versions:

- Apache Wicket 10.0.0 through 10.8.0
- Apache Wicket 9.0.0 through 9.22.0
- Apache Wicket 8.0.0 through 8.17

Description:

FolderUploadsFileManager in Apache Wicket does not validate or sanitize the uploadFieldId parameter or the 
clientFileName
 before constructing file paths, allowing an unauthenticated attacker to
 write arbitrary files outside the intended upload directory or read 
files from arbitrary locations on the server.

This issue affects Apache Wicket: from 8.0.0 through 8.17.0, from 9.0.0 through 9.22.0, from 10.0.0 through 10.8.0.

Users are recommended to upgrade to version 10.9.0, which fixes the issue.

References:

https://github.com/apache/wicket/pull/1432
https://wicket.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-43975