--- title: "CVE-2026-83559: Apache Wicket - Stored XSS" description: "Apache Wicket 8.0.0 to 8.19.0, 9.0.0 to 9.24.0, and 10.0.0 to 10.11.0 contain a stored XSS caused by improper escaping of backslashes in JavaScript string literals in JavaScriptUtils#escapeQuotes(), letting attackers execute arbitrary JavaScript in user sessions, exploit requires attacker-controlled input in validation messages or similar." url: https://panop.io/threat-heartbeat/CVE-2026-83559/ --- # CVE-2026-83559 Apache Wicket - Stored XSS Apache Wicket 8.0.0 to 8.19.0, 9.0.0 to 9.24.0, and 10.0.0 to 10.11.0 contain a stored XSS caused by improper escaping of backslashes in JavaScript string literals in JavaScriptUtils#escapeQuotes(), letting attackers execute arbitrary JavaScript in user sessions, exploit requires attacker-controlled input in validation messages or similar. CVSS base score 7.4 /10 High CISA KEV Not listed Public exploit None known Authentication Not required [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-83559) ## Details Type Stored XSS Impact Stored XSS CVSS vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Published 1 November 2026 Updated 3 November 2026 Weakness [CWE-116](https://cwe.mitre.org/data/definitions/116.html) ## Vendor fix Upgrade to versions 8.20.0, 9.25.0, or 10.12.0 or later. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-83559](https://nvd.nist.gov/vuln/detail/CVE-2026-83559) - [https://lists.apache.org/thread.html/77kc85ztkxdpp7wg7cv61c4539j9s1g3](https://lists.apache.org/thread.html/77kc85ztkxdpp7wg7cv61c4539j9s1g3) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)