CVE-2026-42509

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 v3.1 Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0018

Probability of exploitation

0.40%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
apache	wicket	8.0.0 — 8.17.0
apache	wicket	9.0.0 — 9.22.0
apache	wicket	10.0.0 — 10.9.0

References

Advisories & Patches

https://lists.apache.org/thread/52nrq4tt07gxz4r6sj5gyocz5s6bprjp

Other References

http://www.openwall.com/lists/oss-security/2026/05/06/2

Frequently Asked Questions

What is CVE-2026-42509? +

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. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2026-42509? +

CVE-2026-42509 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0018, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-42509? +

CVE-2026-42509 affects products from apache, specifically: wicket. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-42509? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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