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

What is CVE-2026-43975?

CVE-2026-43975 is a medium-severity path traversal vulnerability in Apache Wicket, published on 6 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-22

Which versions are affected by CVE-2026-43975?

6 open source packages ship an affected version, including org.apache.wicket:wicket-core. It affects 1 product.

Products include Apache Wicket.

How do I fix CVE-2026-43975?

Upgrade org.apache.wicket:wicket-core to 10.9.0 or later.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2026-43975 being exploited?

There is no known exploitation of CVE-2026-43975 in the wild and no public exploit code.

Other vulnerabilities in Apache Wicket

• CVE-2024-36522 Apache Wicket: Remote code execution via XSLT injection Critical 9.8
• CVE-2026-40010 Apache Wicket: possible session fixation using AuthenticatedWebSession Critical 9.1
• CVE-2016-6793 Deserialization in n/a Critical 9.1
• CVE-2016-6806 Apache Wicket vulnerable to CSRF attacks High 8.8
• CVE-2026-71257 Apache Wicket: Configured file upload limits are not enforced when the multipart request has already been parsed High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-3gmf-p6r4-q8m6.