[pitboss] phase 07: Track J.5 + Track L.5 — XPATH_INJECTION corpus + XPath / DOM / lxml adapters

tests/dynamic_fixtures/xpath_injection/java/Vuln.java

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+// Phase 07 (Track J.5) — Java XPATH_INJECTION vuln fixture.
+//
+// The function string-concatenates the attacker-controlled `name`
+// directly into an XPath expression evaluated by
+// `javax.xml.xpath.XPath.evaluate`.  A payload like `alice' or '1'='1`
+// rewraps the selector as `//user[@name='alice' or '1'='1']`,
+// matching every <user> node in the staged document.
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.xpath.XPath;
+import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathFactory;
+import org.w3c.dom.Document;
+import org.w3c.dom.NodeList;
+
+public class Vuln {
+    public static Object run(String name) throws Exception {
+        Document doc = DocumentBuilderFactory.newInstance()
+            .newDocumentBuilder()
+            .parse("xpath_corpus.xml");
+        XPath xp = XPathFactory.newInstance().newXPath();
+        String expr = "//user[@name='" + name + "']";
+        return xp.evaluate(expr, doc, XPathConstants.NODESET);
+    }
+}