Medium severity · published May 6, 2026
CVE-2026-42509
Apache Wicket: crafted strings can break out of the JavaScript sequence
6.1
CVSS
0.4%
EPSS
No
On KEV
Description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Apache Wicket.
This issue affects Apache Wicket: from 8.0.0 through 8.17.0, 9.0.0, from 10.0.0 through 10.8.0.
Users are recommended to upgrade to version 10.9.0, which fixes the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% 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
8.0.0 through 8.17.0; 9.0.0 through 9.22.0; 10.0.0 through 10.8.0 · source: vendor
WI
Wicket · Apache
8.0.0 through 8.17.0; 9.0.0 through 9.22.0; 10.0.0 before 10.9.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42509
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42509
Vendor Advisory
https://lists.apache.org/thread/52nrq4tt07gxz4r6sj5gyocz5s6bprjp
Mailing List
http://www.openwall.com/lists/oss-security/2026/05/06/2
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