diff --git a/src/test/java/pipeline/CpsScmFlowDefinitionSubversionTest.java b/src/test/java/pipeline/CpsScmFlowDefinitionSubversionTest.java
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+/*
+ * The MIT License
+ *
+ * Copyright 2024 CloudBees, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package pipeline;
+
+import hudson.Functions;
+import hudson.scm.SubversionSCM;
+import java.io.File;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import jenkins.plugins.git.GitSampleRepoRule;
+import jenkins.plugins.git.GitStep;
+import jenkins.scm.impl.subversion.SubversionSampleRepoRule;
+import org.apache.commons.io.FileUtils;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.not;
+import static org.hamcrest.io.FileMatchers.anExistingFile;
+import org.jenkinsci.plugins.workflow.cps.CpsScmFlowDefinition;
+import org.jenkinsci.plugins.workflow.job.WorkflowJob;
+import org.jenkinsci.plugins.workflow.job.WorkflowRun;
+import static org.junit.Assume.assumeFalse;
+import org.junit.ClassRule;
+import org.junit.Rule;
+import org.junit.Test;
+import org.jvnet.hudson.test.BuildWatcher;
+import org.jvnet.hudson.test.Issue;
+import org.jvnet.hudson.test.JenkinsRule;
+
+public final class CpsScmFlowDefinitionSubversionTest {
+
+    @ClassRule public static BuildWatcher buildWatcher = new BuildWatcher();
+    @Rule public JenkinsRule r = new JenkinsRule();
+    @Rule public GitSampleRepoRule sampleRepo = new GitSampleRepoRule();
+    @Rule public SubversionSampleRepoRule sampleRepoSvn = new SubversionSampleRepoRule();
+
+    @Issue("SECURITY-2463")
+    @Test public void checkoutDirectoriesAreNotReusedByDifferentScms() throws Exception {
+        assumeFalse(Functions.isWindows()); // Checkout hook is not cross-platform.
+        sampleRepo.init();
+        sampleRepo.write("Jenkinsfile", "echo('git library')");
+        sampleRepo.git("add", "Jenkinsfile");
+        sampleRepo.git("commit", "--message=init");
+        sampleRepoSvn.init();
+        sampleRepoSvn.write("Jenkinsfile", "echo('subversion library')");
+        // Copy .git folder from the Git repo into the SVN repo as data.
+        File gitDirInSvnRepo = new File(sampleRepoSvn.wc(), ".git");
+        FileUtils.copyDirectory(new File(sampleRepo.getRoot(), ".git"), gitDirInSvnRepo);
+        String jenkinsRootDir = r.jenkins.getRootDir().toString();
+        // Add a Git post-checkout hook to the .git folder in the SVN repo.
+        Path postCheckoutHook = gitDirInSvnRepo.toPath().resolve("hooks/post-checkout");
+        // Always create hooks directory for compatibility with https://github.com/jenkinsci/git-plugin/pull/1207.
+        Files.createDirectories(postCheckoutHook.getParent());
+        Files.write(postCheckoutHook, ("#!/bin/sh\ntouch '" + jenkinsRootDir + "/hook-executed'\n").getBytes(StandardCharsets.UTF_8));
+        sampleRepoSvn.svnkit("add", sampleRepoSvn.wc() + "/Jenkinsfile");
+        sampleRepoSvn.svnkit("add", sampleRepoSvn.wc() + "/.git");
+        sampleRepoSvn.svnkit("propset", "svn:executable", "ON", sampleRepoSvn.wc() + "/.git/hooks/post-checkout");
+        sampleRepoSvn.svnkit("commit", "--message=init", sampleRepoSvn.wc());
+        // Run a build using the SVN repo.
+        WorkflowJob p = r.createProject(WorkflowJob.class);
+        p.setDefinition(new CpsScmFlowDefinition(new SubversionSCM(sampleRepoSvn.trunkUrl()), "Jenkinsfile"));
+        r.buildAndAssertSuccess(p);
+        // Run a build using the Git repo. It should be checked out to a different directory than the SVN repo.
+        p.setDefinition(new CpsScmFlowDefinition(new GitStep(sampleRepo.toString()).createSCM(), "Jenkinsfile"));
+        WorkflowRun b2 = r.buildAndAssertSuccess(p);
+        assertThat(new File(r.jenkins.getRootDir(), "hook-executed"), not(anExistingFile()));
+    }
+
+}