CVE-2026-83559 Apache Software Foundation CVE debrief

Who should care

Developers and administrators of applications using Apache Wicket versions 8.0.0 through 8.19.0, 9.0.0 through 9.24.0, and 10.0.0 through 10.11.0 should assess exposure and consider upgrading to a fixed version to prevent potential JavaScript injection attacks and exposure of sensitive data or application compromise. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Why it matters

The CVE-2026-83559 vulnerability in Apache Wicket allows for JavaScript injection via improper output encoding or escaping, affecting versions 8.0.0 through 8.19.0, 9.0.0 through 9.24.0, and 10.0.0 through 10.11.0. Developers and administrators of affected applications should assess exposure and consider upgrading to a fixed version to prevent potential JavaScript injection attacks and exposure of sensitive data or application compromise.

• Potential JavaScript injection attacks
• Exposure of sensitive data or application compromise
• Defensive priority for upgrading to a fixed version
• Verification of affected applications and components

Technical summary

The JavaScriptUtils#escapeQuotes() method in Apache Wicket does not properly escape backslashes, leading to a potential JavaScript injection vulnerability. This method is public, not deprecated, and its documentation states that its result can be part of a JavaScript call. The vulnerability affects Apache Wicket versions 8.0.0 through 8.19.0, 9.0.0 through 9.24.0, and 10.0.0 through 10.11.0. The issue can be exploited through components such as org.apache.wicket.extensions.ajax.markup.html.AjaxEditableLabel, where an attacker can influence the validation message.

Defensive priority

Upgrade to version 8.20.0, 9.25.0, or 10.12.0 to fix the issue.

Recommended defensive actions

• Upgrade to version 8.20.0, 9.25.0, or 10.12.0
• Review and update affected applications
• Monitor for potential JavaScript injection attacks
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability, its impact, and affected versions. The vulnerability is caused by the JavaScriptUtils#escapeQuotes() method not properly escaping backslashes, leading to a potential JavaScript injection vulnerability. The method is public and not deprecated, and its documentation states that its result can be part of a JavaScript call. The issue affects Apache Wicket versions 8.0.0 through 8.19.0, 9.0.0 through 9.24.0, and 10.0.0 through 10.11.0. Users are

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.