diff --git a/registry/coder/modules/amazon-dcv-windows/README.md b/registry/coder/modules/amazon-dcv-windows/README.md
index 63f6797f4..63b14d10e 100644
--- a/registry/coder/modules/amazon-dcv-windows/README.md
+++ b/registry/coder/modules/amazon-dcv-windows/README.md
@@ -18,7 +18,7 @@ Enable DCV Server and Web Client on Windows workspaces.
 module "dcv" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/amazon-dcv-windows/coder"
-  version  = "1.1.1"
+  version  = "1.1.2"
   agent_id = coder_agent.main.id
 }
 
diff --git a/registry/coder/modules/amazon-dcv-windows/amazon-dcv-windows.tftest.hcl b/registry/coder/modules/amazon-dcv-windows/amazon-dcv-windows.tftest.hcl
new file mode 100644
index 000000000..dd1b64651
--- /dev/null
+++ b/registry/coder/modules/amazon-dcv-windows/amazon-dcv-windows.tftest.hcl
@@ -0,0 +1,36 @@
+run "plan_with_defaults" {
+  command = plan
+
+  variables {
+    agent_id = "test-agent-id"
+  }
+
+  assert {
+    condition     = resource.coder_app.web-dcv.url == "https://localhost:8443/?username=Administrator&password=coderDCV%21"
+    error_message = "The default DCV app URL should preserve its credentials."
+  }
+
+  assert {
+    condition     = strcontains(resource.coder_script.install-dcv.script, "$adminPassword = 'coderDCV!'")
+    error_message = "The default password should use a PowerShell single-quoted string."
+  }
+}
+
+run "plan_with_special_characters" {
+  command = plan
+
+  variables {
+    agent_id       = "test-agent-id"
+    admin_password = "N;JVO*U\\mL^a*P\"'`$&<>|#%+"
+  }
+
+  assert {
+    condition     = endswith(resource.coder_app.web-dcv.url, "username=Administrator&password=${urlencode(var.admin_password)}")
+    error_message = "The DCV app URL should encode each credential parameter."
+  }
+
+  assert {
+    condition     = strcontains(resource.coder_script.install-dcv.script, format("$adminPassword = '%s'", replace(var.admin_password, "'", "''")))
+    error_message = "The PowerShell script should preserve special characters."
+  }
+}
diff --git a/registry/coder/modules/amazon-dcv-windows/install-dcv.ps1 b/registry/coder/modules/amazon-dcv-windows/install-dcv.ps1
index 2b1c9f4b2..101a979bb 100644
--- a/registry/coder/modules/amazon-dcv-windows/install-dcv.ps1
+++ b/registry/coder/modules/amazon-dcv-windows/install-dcv.ps1
@@ -1,5 +1,5 @@
 # Terraform variables
-$adminPassword = "${admin_password}"
+$adminPassword = '${admin_password}'
 $port = "${port}"
 $webURLPath = "${web_url_path}"
 
diff --git a/registry/coder/modules/amazon-dcv-windows/main.test.ts b/registry/coder/modules/amazon-dcv-windows/main.test.ts
new file mode 100644
index 000000000..b56077a1e
--- /dev/null
+++ b/registry/coder/modules/amazon-dcv-windows/main.test.ts
@@ -0,0 +1,105 @@
+import { describe, it } from "bun:test";
+import {
+  findResourceInstance,
+  runTerraformApply,
+  runTerraformInit,
+  testRequiredVariables,
+} from "~test";
+
+type TestVariables = Readonly<{
+  agent_id: string;
+  admin_password?: string;
+}>;
+
+const assertCredentialRoundTrip = (
+  actual: string | null,
+  expected: string,
+  context: string,
+) => {
+  if (actual !== expected) {
+    throw new Error(`${context} did not preserve the credential`);
+  }
+};
+
+const extractPowerShellPassword = (script: string): string | null => {
+  const assignment = /^\$adminPassword = '((?:[^']|'')*)'[ \t]*\r?$/m.exec(
+    script,
+  );
+
+  return assignment?.[1]?.replaceAll("''", "'") ?? null;
+};
+
+const renderCredentials = async (adminPassword?: string) => {
+  const variables: TestVariables = {
+    agent_id: "test-agent-id",
+    ...(adminPassword === undefined ? {} : { admin_password: adminPassword }),
+  };
+  const state = await runTerraformApply<TestVariables>(
+    import.meta.dir,
+    variables,
+  );
+  const script = findResourceInstance(state, "coder_script", "install-dcv");
+  const app = findResourceInstance(state, "coder_app", "web-dcv");
+
+  return {
+    appUrl: new URL(app.url),
+    password: extractPowerShellPassword(script.script),
+  };
+};
+
+describe("amazon-dcv-windows", async () => {
+  await runTerraformInit(import.meta.dir);
+
+  testRequiredVariables<TestVariables>(import.meta.dir, {
+    agent_id: "test-agent-id",
+  });
+
+  it("preserves default credentials", async () => {
+    const rendered = await renderCredentials();
+
+    assertCredentialRoundTrip(
+      rendered.password,
+      "coderDCV!",
+      "Default PowerShell rendering",
+    );
+    assertCredentialRoundTrip(
+      rendered.appUrl.searchParams.get("username"),
+      "Administrator",
+      "Default URL username decoding",
+    );
+    assertCredentialRoundTrip(
+      rendered.appUrl.searchParams.get("password"),
+      "coderDCV!",
+      "Default URL password decoding",
+    );
+  });
+
+  it("preserves special characters in the PowerShell script", async () => {
+    const specialPassword =
+      String.raw`N;JVO*U\mL^a*P"` + "'" + "`" + "$&<>|#%+";
+    const rendered = await renderCredentials(specialPassword);
+
+    assertCredentialRoundTrip(
+      rendered.password,
+      specialPassword,
+      "PowerShell rendering",
+    );
+  });
+
+  it("preserves special characters in URL parameters", async () => {
+    const specialPassword =
+      String.raw`N;JVO*U\mL^a*P"` + "'" + "`" + "$&<>|#%+";
+    const rendered = await renderCredentials(specialPassword);
+
+    assertCredentialRoundTrip(
+      rendered.appUrl.searchParams.get("username"),
+      "Administrator",
+      "URL username decoding",
+    );
+    assertCredentialRoundTrip(
+      rendered.appUrl.searchParams.get("password"),
+      specialPassword,
+      "URL password decoding",
+    );
+  });
+});
diff --git a/registry/coder/modules/amazon-dcv-windows/main.tf b/registry/coder/modules/amazon-dcv-windows/main.tf
index 223e3b785..3c3ae5ab8 100644
--- a/registry/coder/modules/amazon-dcv-windows/main.tf
+++ b/registry/coder/modules/amazon-dcv-windows/main.tf
@@ -54,7 +54,7 @@ resource "coder_app" "web-dcv" {
   agent_id     = var.agent_id
   slug         = var.slug
   display_name = "Web DCV"
-  url          = "https://localhost:${var.port}${local.web_url_path}?username=${local.admin_username}&password=${var.admin_password}"
+  url          = "https://localhost:${var.port}${local.web_url_path}?username=${urlencode(local.admin_username)}&password=${urlencode(var.admin_password)}"
   icon         = "/icon/dcv.svg"
   subdomain    = var.subdomain
   order        = var.order
@@ -67,7 +67,7 @@ resource "coder_script" "install-dcv" {
   icon         = "/icon/dcv.svg"
   run_on_start = true
   script = templatefile("${path.module}/install-dcv.ps1", {
-    admin_password : var.admin_password,
+    admin_password : local.ps_admin_password,
     port : var.port,
     web_url_path : local.web_url_path
   })
@@ -77,8 +77,9 @@ data "coder_workspace" "me" {}
 data "coder_workspace_owner" "me" {}
 
 locals {
-  web_url_path   = var.subdomain ? "/" : format("/@%s/%s/apps/%s", data.coder_workspace_owner.me.name, data.coder_workspace.me.name, var.slug)
-  admin_username = "Administrator"
+  web_url_path      = var.subdomain ? "/" : format("/@%s/%s/apps/%s", data.coder_workspace_owner.me.name, data.coder_workspace.me.name, var.slug)
+  admin_username    = "Administrator"
+  ps_admin_password = replace(var.admin_password, "'", "''")
 }
 
 output "web_url_path" {