diff --git a/app/Entities/Managers/PageContent.php b/app/Entities/Managers/PageContent.php
index a787e5d99..7338a36b3 100644
--- a/app/Entities/Managers/PageContent.php
+++ b/app/Entities/Managers/PageContent.php
@@ -296,6 +296,24 @@ class PageContent
             $scriptElem->parentNode->removeChild($scriptElem);
         }
 
+        // Remove clickable links to JavaScript URI
+        $badLinks = $xPath->query('//*[contains(@href, \'javascript:\')]');
+        foreach ($badLinks as $badLink) {
+            $badLink->parentNode->removeChild($badLink);
+        }
+
+        // Remove forms with calls to JavaScript URI
+        $badForms = $xPath->query('//*[contains(@action, \'javascript:\')] | //*[contains(@formaction, \'javascript:\')]');
+        foreach ($badForms as $badForm) {
+            $badForm->parentNode->removeChild($badForm);
+        }
+
+        // Remove meta tag to prevent external redirects
+        $metaTags = $xPath->query('//meta[contains(@content, \'url\')]');
+        foreach ($metaTags as $metaTag) {
+            $metaTag->parentNode->removeChild($metaTag);
+        }
+
         // Remove data or JavaScript iFrames
         $badIframes = $xPath->query('//*[contains(@src, \'data:\')] | //*[contains(@src, \'javascript:\')] | //*[@srcdoc]');
         foreach ($badIframes as $badIframe) {
diff --git a/app/Http/Controllers/AttachmentController.php b/app/Http/Controllers/AttachmentController.php
index 0830693bc..f52143292 100644
--- a/app/Http/Controllers/AttachmentController.php
+++ b/app/Http/Controllers/AttachmentController.php
@@ -110,7 +110,7 @@ class AttachmentController extends Controller
         try {
             $this->validate($request, [
                 'attachment_edit_name' => 'required|string|min:1|max:255',
-                'attachment_edit_url' =>  'string|min:1|max:255'
+                'attachment_edit_url' =>  'string|min:1|max:255|safe_url'
             ]);
         } catch (ValidationException $exception) {
             return response()->view('attachments.manager-edit-form', array_merge($request->only(['attachment_edit_name', 'attachment_edit_url']), [
@@ -145,7 +145,7 @@ class AttachmentController extends Controller
             $this->validate($request, [
                 'attachment_link_uploaded_to' => 'required|integer|exists:pages,id',
                 'attachment_link_name' => 'required|string|min:1|max:255',
-                'attachment_link_url' =>  'required|string|min:1|max:255'
+                'attachment_link_url' =>  'required|string|min:1|max:255|safe_url'
             ]);
         } catch (ValidationException $exception) {
             return response()->view('attachments.manager-link-form', array_merge($request->only(['attachment_link_name', 'attachment_link_url']), [
@@ -161,7 +161,7 @@ class AttachmentController extends Controller
 
         $attachmentName = $request->get('attachment_link_name');
         $link = $request->get('attachment_link_url');
-        $attachment = $this->attachmentService->saveNewFromLink($attachmentName, $link, $pageId);
+        $attachment = $this->attachmentService->saveNewFromLink($attachmentName, $link, intval($pageId));
 
         return view('attachments.manager-link-form', [
             'pageId' => $pageId,
diff --git a/app/Providers/AppServiceProvider.php b/app/Providers/AppServiceProvider.php
index 1cc3e09c2..f41815399 100644
--- a/app/Providers/AppServiceProvider.php
+++ b/app/Providers/AppServiceProvider.php
@@ -43,6 +43,13 @@ class AppServiceProvider extends ServiceProvider
             return substr_count($uploadName, '.') < 2;
         });
 
+        Validator::extend('safe_url', function ($attribute, $value, $parameters, $validator) {
+            $cleanLinkName = strtolower(trim($value));
+            $isJs = strpos($cleanLinkName, 'javascript:') === 0;
+            $isData = strpos($cleanLinkName, 'data:') === 0;
+            return !$isJs && !$isData;
+        });
+
         // Custom blade view directives
         Blade::directive('icon', function ($expression) {
             return "<?php echo icon($expression); ?>";
diff --git a/app/Uploads/AttachmentService.php b/app/Uploads/AttachmentService.php
index 02220771a..e85901e17 100644
--- a/app/Uploads/AttachmentService.php
+++ b/app/Uploads/AttachmentService.php
@@ -88,12 +88,8 @@ class AttachmentService extends UploadService
 
     /**
      * Save a new File attachment from a given link and name.
-     * @param string $name
-     * @param string $link
-     * @param int $page_id
-     * @return Attachment
      */
-    public function saveNewFromLink($name, $link, $page_id)
+    public function saveNewFromLink(string $name, string $link, int $page_id): Attachment
     {
         $largestExistingOrder = Attachment::where('uploaded_to', '=', $page_id)->max('order');
         return Attachment::forceCreate([
@@ -123,13 +119,11 @@ class AttachmentService extends UploadService
 
     /**
      * Update the details of a file.
-     * @param Attachment $attachment
-     * @param $requestData
-     * @return Attachment
      */
-    public function updateFile(Attachment $attachment, $requestData)
+    public function updateFile(Attachment $attachment, array $requestData): Attachment
     {
         $attachment->name = $requestData['name'];
+
         if (isset($requestData['link']) && trim($requestData['link']) !== '') {
             $attachment->path = $requestData['link'];
             if (!$attachment->external) {
@@ -137,6 +131,7 @@ class AttachmentService extends UploadService
                 $attachment->external = true;
             }
         }
+
         $attachment->save();
         return $attachment;
     }
diff --git a/dev/docker/entrypoint.node.sh b/dev/docker/entrypoint.node.sh
index e59e1e8a0..a8f33fd3d 100755
--- a/dev/docker/entrypoint.node.sh
+++ b/dev/docker/entrypoint.node.sh
@@ -5,4 +5,4 @@ set -e
 npm install
 npm rebuild node-sass
 
-exec npm run watch
\ No newline at end of file
+SHELL=/bin/sh exec npm run watch
diff --git a/package.json b/package.json
index c3ca2add6..d5e93a31e 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
     "build:css:watch": "sass ./resources/sass:./public/dist --watch",
     "build:css:production": "sass ./resources/sass:./public/dist -s compressed",
     "build:js:dev": "esbuild --bundle ./resources/js/index.js --outfile=public/dist/app.js --sourcemap --target=es2019 --main-fields=module,main",
-    "build:js:watch": "chokidar \"./resources/**/*.js\" -c \"npm run build:js:dev\"",
+    "build:js:watch": "chokidar --initial \"./resources/**/*.js\" -c \"npm run build:js:dev\"",
     "build:js:production": "NODE_ENV=production esbuild --bundle ./resources/js/index.js --outfile=public/dist/app.js --sourcemap --target=es2019 --main-fields=module,main --minify",
     "build": "npm-run-all --parallel build:*:dev",
     "production": "npm-run-all --parallel build:*:production",
diff --git a/resources/lang/en/validation.php b/resources/lang/en/validation.php
index 76b57a2a3..578ea999f 100644
--- a/resources/lang/en/validation.php
+++ b/resources/lang/en/validation.php
@@ -90,6 +90,7 @@ return [
     'required_without'     => 'The :attribute field is required when :values is not present.',
     'required_without_all' => 'The :attribute field is required when none of :values are present.',
     'same'                 => 'The :attribute and :other must match.',
+    'safe_url'             => 'The provided link may not be safe.',
     'size'                 => [
         'numeric' => 'The :attribute must be :size.',
         'file'    => 'The :attribute must be :size kilobytes.',
diff --git a/tests/Entity/PageContentTest.php b/tests/Entity/PageContentTest.php
index 99547fd17..e97df2c7e 100644
--- a/tests/Entity/PageContentTest.php
+++ b/tests/Entity/PageContentTest.php
@@ -159,6 +159,72 @@ class PageContentTest extends TestCase
 
     }
 
+    public function test_javascript_uri_links_are_removed()
+    {
+        $checks = [
+            '<a id="xss" href="javascript:alert(document.cookie)>Click me</a>',
+            '<a id="xss" href="javascript: alert(document.cookie)>Click me</a>'
+        ];
+
+        $this->asEditor();
+        $page = Page::first();
+
+        foreach ($checks as $check) {
+            $page->html = $check;
+            $page->save();
+
+            $pageView = $this->get($page->getUrl());
+            $pageView->assertStatus(200);
+            $pageView->assertElementNotContains('.page-content', '<a id="xss">');
+            $pageView->assertElementNotContains('.page-content', 'href=javascript:');
+        }
+    }
+    public function test_form_actions_with_javascript_are_removed()
+    {
+        $checks = [
+            '<form><input id="xss" type=submit formaction=javascript:alert(document.domain) value=Submit><input></form>',
+            '<form ><button id="xss" formaction=javascript:alert(document.domain)>Click me</button></form>',
+            '<form id="xss" action=javascript:alert(document.domain)><input type=submit value=Submit></form>'
+        ];
+
+        $this->asEditor();
+        $page = Page::first();
+
+        foreach ($checks as $check) {
+            $page->html = $check;
+            $page->save();
+
+            $pageView = $this->get($page->getUrl());
+            $pageView->assertStatus(200);
+            $pageView->assertElementNotContains('.page-content', '<button id="xss"');
+            $pageView->assertElementNotContains('.page-content', '<input id="xss"');
+            $pageView->assertElementNotContains('.page-content', '<form id="xss"');
+            $pageView->assertElementNotContains('.page-content', 'action=javascript:');
+            $pageView->assertElementNotContains('.page-content', 'formaction=javascript:');
+        }
+    }
+    
+    public function test_metadata_redirects_are_removed()
+    {
+        $checks = [
+            '<meta http-equiv="refresh" content="0; url=//external_url">',
+        ];
+
+        $this->asEditor();
+        $page = Page::first();
+
+        foreach ($checks as $check) {
+            $page->html = $check;
+            $page->save();
+
+            $pageView = $this->get($page->getUrl());
+            $pageView->assertStatus(200);
+            $pageView->assertElementNotContains('.page-content', '<meta>');
+            $pageView->assertElementNotContains('.page-content', '</meta>');
+            $pageView->assertElementNotContains('.page-content', 'content=');
+            $pageView->assertElementNotContains('.page-content', 'external_url');
+        }
+    }
     public function test_page_inline_on_attributes_removed_by_default()
     {
         $this->asEditor();
diff --git a/tests/Uploads/AttachmentTest.php b/tests/Uploads/AttachmentTest.php
index a7efe08ab..5838b019e 100644
--- a/tests/Uploads/AttachmentTest.php
+++ b/tests/Uploads/AttachmentTest.php
@@ -3,39 +3,51 @@
 use BookStack\Uploads\Attachment;
 use BookStack\Entities\Page;
 use BookStack\Auth\Permissions\PermissionService;
+use BookStack\Uploads\AttachmentService;
+use Illuminate\Http\UploadedFile;
 use Tests\TestCase;
+use Tests\TestResponse;
 
 class AttachmentTest extends TestCase
 {
     /**
      * Get a test file that can be uploaded
-     * @param $fileName
-     * @return \Illuminate\Http\UploadedFile
      */
-    protected function getTestFile($fileName)
+    protected function getTestFile(string $fileName): UploadedFile
     {
-        return new \Illuminate\Http\UploadedFile(base_path('tests/test-data/test-file.txt'), $fileName, 'text/plain', 55, null, true);
+        return new UploadedFile(base_path('tests/test-data/test-file.txt'), $fileName, 'text/plain', 55, null, true);
     }
 
     /**
      * Uploads a file with the given name.
-     * @param $name
-     * @param int $uploadedTo
-     * @return \Illuminate\Foundation\Testing\TestResponse
      */
-    protected function uploadFile($name, $uploadedTo = 0)
+    protected function uploadFile(string $name, int $uploadedTo = 0): \Illuminate\Foundation\Testing\TestResponse
     {
         $file = $this->getTestFile($name);
         return $this->call('POST', '/attachments/upload', ['uploaded_to' => $uploadedTo], [], ['file' => $file], []);
     }
 
+    /**
+     * Create a new attachment
+     */
+    protected function createAttachment(Page $page): Attachment
+    {
+        $this->post('attachments/link', [
+            'attachment_link_url' => 'https://example.com',
+            'attachment_link_name' => 'Example Attachment Link',
+            'attachment_link_uploaded_to' => $page->id,
+        ]);
+
+        return Attachment::query()->latest()->first();
+    }
+
     /**
      * Delete all uploaded files.
      * To assist with cleanup.
      */
     protected function deleteUploads()
     {
-        $fileService = $this->app->make(\BookStack\Uploads\AttachmentService::class);
+        $fileService = $this->app->make(AttachmentService::class);
         foreach (Attachment::all() as $file) {
             $fileService->deleteFile($file);
         }
@@ -145,21 +157,14 @@ class AttachmentTest extends TestCase
         $page = Page::first();
         $this->asAdmin();
 
-        $this->call('POST', 'attachments/link', [
-            'attachment_link_url' => 'https://example.com',
-            'attachment_link_name' => 'Example Attachment Link',
-            'attachment_link_uploaded_to' => $page->id,
-        ]);
-
-        $attachmentId = Attachment::first()->id;
-
-        $update = $this->call('PUT', 'attachments/' . $attachmentId, [
+        $attachment = $this->createAttachment($page);
+        $update = $this->call('PUT', 'attachments/' . $attachment->id, [
             'attachment_edit_name' => 'My new attachment name',
             'attachment_edit_url' => 'https://test.example.com'
         ]);
 
         $expectedData = [
-            'id' => $attachmentId,
+            'id' => $attachment->id,
             'path' => 'https://test.example.com',
             'name' => 'My new attachment name',
             'uploaded_to' => $page->id
@@ -242,4 +247,45 @@ class AttachmentTest extends TestCase
 
         $this->deleteUploads();
     }
+
+    public function test_data_and_js_links_cannot_be_attached_to_a_page()
+    {
+        $page = Page::first();
+        $this->asAdmin();
+
+        $badLinks = [
+            'javascript:alert("bunny")',
+            ' javascript:alert("bunny")',
+            'JavaScript:alert("bunny")',
+            "\t\n\t\nJavaScript:alert(\"bunny\")",
+            "data:text/html;<a></a>",
+            "Data:text/html;<a></a>",
+            "Data:text/html;<a></a>",
+        ];
+
+        foreach ($badLinks as $badLink) {
+            $linkReq = $this->post('attachments/link', [
+                'attachment_link_url' => $badLink,
+                'attachment_link_name' => 'Example Attachment Link',
+                'attachment_link_uploaded_to' => $page->id,
+            ]);
+            $linkReq->assertStatus(422);
+            $this->assertDatabaseMissing('attachments', [
+                'path' => $badLink,
+            ]);
+        }
+
+        $attachment = $this->createAttachment($page);
+
+        foreach ($badLinks as $badLink) {
+            $linkReq = $this->put('attachments/' . $attachment->id, [
+                'attachment_edit_url' => $badLink,
+                'attachment_edit_name' => 'Example Attachment Link',
+            ]);
+            $linkReq->assertStatus(422);
+            $this->assertDatabaseMissing('attachments', [
+                'path' => $badLink,
+            ]);
+        }
+    }
 }