Medium severity · published Jul 27, 2026
CVE-2026-66391
Apache Wicket: leaked and missing CSP headers
6.5
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 50% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AW
Apache Wicket · Apache Software Foundation
9.0.0 through 9.23.0; 10.0.0 through 10.9.0 · source: vendor
WI
Wicket · Apache
9.0.0 through 9.23.0; 10.0.0 before 10.10.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-66391
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-66391
Mailing List
https://lists.apache.org/thread/hfzcgjsbmmthzchtb8b8nv47d95scmqk
Mailing List
http://www.openwall.com/lists/oss-security/2026/07/27/5
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