CVE-2026-66391: Apache Wicket: leaked and missing CSP headers

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-27 · updated 2026-10-24
Weakness: CWE-330

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.

Affected products

Apache Software Foundation Apache Wicket: from 9.0.0 through 9.23.0; from 10.0.0 before 10.10.0 — fixed in 10.10.0

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Wicket 10.10.0. Check the vendor advisory for mitigations.

References

https://lists.apache.org/thread/hfzcgjsbmmthzchtb8b8nv47d95scmqk
http://www.openwall.com/lists/oss-security/2026/07/27/5

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