CVE-2026-66391 Apache Wicket: leaked and missing CSP headers
Apache Wicket fails to properly generate or include Content Security Policy headers, allowing attackers to bypass CSP protections.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-66391?
CVE-2026-66391 is a medium-severity vulnerability in Apache Wicket, published on 27 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Use of Insufficiently Random Values, Protection Mechanism Failure vulnerability in Apache Wicket.
This issue affects Apache Wicket: from 9.0.0 through 9.23.0, from 10.0.0 through 10.9.0.
Users are recommended to upgrade to version 10.10.0, which fixes the issue.
Which versions are affected by CVE-2026-66391?
It affects 1 product.
Products include Apache Wicket.
How do I fix CVE-2026-66391?
No fix has been published for CVE-2026-66391 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-66391 being exploited?
There is no known exploitation of CVE-2026-66391 in the wild and no public exploit code.
Other vulnerabilities in Apache Wicket
- CVE-2024-36522 Apache Wicket: Remote code execution via XSLT injection
- CVE-2026-40010 Apache Wicket: possible session fixation using AuthenticatedWebSession
- CVE-2016-6793 Deserialization in n/a
- CVE-2016-6806 Apache Wicket vulnerable to CSRF attacks
- CVE-2026-71257 Apache Wicket: Configured file upload limits are not enforced when the multipart request has already been parsed
Sources
Also known as GHSA-r3h3-mj63-mm3p.