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CVE-2026-50229 is a basic reflected cross-site scripting vulnerability in Apache Tomcat's Number Guess example application. The example fails to properly neutralize script-related HTML tags when rendering user-controlled input in an HTML response, allowing injected script to execute in a victim's browser. Affected releases include Tomcat 11.0.0-M1 through 11.0.22, 10.1.0-M1 through 10.1.55, 9.0.0.M1 through 9.0.118, 8.5.0 through 8.5.100, and 7.0.0 through 7.0.109. End-of-support releases may also be affected.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
Repository contains a single Python exploit/scanner script (Tomcat.py) and a README. The script is a standalone tool, not part of a major exploit framework. Its purpose is to test Apache Tomcat's bundled examples application for a reflected XSS issue identified as CVE-2026-50229, specifically the numguess.jsp demo page. The code defines a TomcatXSSScanner class, initializes a requests session with a browser-like User-Agent, generates multiple XSS payloads, and scans several hardcoded path variants of the Tomcat examples endpoint. It tracks scan statistics, records findings in a ScanResult dataclass, prints results, and saves reports to a local scan_results directory. Based on the visible payload content, the exploit capability goes beyond passive detection: it attempts active browser-side JavaScript execution, including a full-page DOM rewrite/defacement payload and cookie access demonstration. Because it generates PoC URLs and reports confirmed findings, it is best characterized as an operational XSS scanner/exploit PoC rather than a pure detector. The README documents the claimed root cause in the JSP example application and identifies the vulnerable location as webapps/examples/jsp/num/numguess.jsp.
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17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability referenced in a Nutanix AOS security notice/plugin, but no specific technical details are provided in the content.
A cross-site scripting vulnerability in the Apache Tomcat Number Guess example/template, apparently involving numguess.jsp and NumberGuessBean input reflected into HTML, enabling script injection.
An Apache Tomcat cross-site scripting vulnerability in the Number Guess example application.
A basic cross-site scripting vulnerability (CWE-80) in Apache Tomcat's number guess example application. It affects multiple supported and legacy Tomcat branches and is fixed by upgrading to Tomcat 11.0.23, 10.1.56, or 9.0.119.
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Cross-references every affected SKU, including bundled OEM variants.
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