diff --git a/source/changelog.txt b/source/changelog.txt
index 4e52f4a..6125179 100644
--- a/source/changelog.txt
+++ b/source/changelog.txt
@@ -9,6 +9,7 @@
 #### Removed
 #### Fixed
 #### Security
+- Escape translated strings to prevent HTML injections
 
 ### [1.4.0]
 #### Changed
diff --git a/source/front/blocks/events-list/edit.js b/source/front/blocks/events-list/edit.js
index e1c28e9..d46b5ae 100644
--- a/source/front/blocks/events-list/edit.js
+++ b/source/front/blocks/events-list/edit.js
@@ -7,6 +7,7 @@ import {
   hideErrorMessages,
   showLoadingIndicator,
 } from '../../events-displayer.js'
+import Formatter from '../../formatter.js'
 
 const { InspectorControls, useBlockProps } = wp.blockEditor
 const { Panel, PanelBody } = wp.components
@@ -73,12 +74,18 @@ export default ({ attributes, setAttributes }) => {
   return [
     <InspectorControls>
       <Panel>
-        <PanelBody title={__('Events List Settings', '<wordpress-name>')}>
+        <PanelBody
+          title={Formatter.escapeHTML(
+            __('Events List Settings', '<wordpress-name>'),
+          )}
+        >
           <label
             className="components-base-control__label"
             htmlFor={NAME + '_events-count'}
           >
-            {__('Number of events to show', '<wordpress-name>')}
+            {Formatter.escapeHTML(
+              __('Number of events to show', '<wordpress-name>'),
+            )}
           </label>
           <input
             className="components-text-control__input"
@@ -91,7 +98,9 @@ export default ({ attributes, setAttributes }) => {
             className="components-base-control__label"
             htmlFor={NAME + '_group-name'}
           >
-            {__('Group name (optional)', '<wordpress-name>')}
+            {Formatter.escapeHTML(
+              __('Group name (optional)', '<wordpress-name>'),
+            )}
           </label>
           <input
             className="components-text-control__input"
@@ -105,13 +114,17 @@ export default ({ attributes, setAttributes }) => {
     </InspectorControls>,
     <div {...blockProps}>
       <div className="general-error" style={{ display: 'none' }}>
-        {__('The events could not be loaded!', '<wordpress-name>')}
+        {Formatter.escapeHTML(
+          __('The events could not be loaded!', '<wordpress-name>'),
+        )}
       </div>
       <div className="group-not-found" style={{ display: 'none' }}>
-        {__('The group could not be found!', '<wordpress-name>')}
+        {Formatter.escapeHTML(
+          __('The group could not be found!', '<wordpress-name>'),
+        )}
       </div>
       <div className="loading-indicator" style={{ display: 'none' }}>
-        {__('Loading...', '<wordpress-name>')}
+        {Formatter.escapeHTML(__('Loading...', '<wordpress-name>'))}
       </div>
       <ul style={{ 'list-style-type': 'none', 'padding-left': 0 }}></ul>
       <a
@@ -119,7 +132,7 @@ export default ({ attributes, setAttributes }) => {
         target="_blank"
         style={{ display: 'inline-block', 'margin-top': '20px;' }}
       >
-        {__('Show more events', '<wordpress-name>')}
+        {Formatter.escapeHTML(__('Show more events', '<wordpress-name>'))}
       </a>
     </div>,
   ]
diff --git a/source/front/formatter-test.js b/source/front/formatter-test.js
index d34dd60..b810343 100644
--- a/source/front/formatter-test.js
+++ b/source/front/formatter-test.js
@@ -1,6 +1,18 @@
 import test from 'ava'
+import { JSDOM } from 'jsdom'
+
 import Formatter from './formatter.js'
 
+test.beforeEach(() => {
+  const dom = new JSDOM()
+  global.document = dom.window.document
+})
+
+test('#escapeHTML', (t) => {
+  const escaped = Formatter.escapeHTML('<b>a</b>')
+  t.is(escaped, '&lt;b&gt;a&lt;/b&gt;')
+})
+
 test('#formatDate one date', (t) => {
   const date = Formatter.formatDate({
     start: '2021-04-15T10:30:00Z',
diff --git a/source/front/formatter.js b/source/front/formatter.js
index 614db12..5deda7c 100644
--- a/source/front/formatter.js
+++ b/source/front/formatter.js
@@ -1,6 +1,12 @@
 import DateTimeWrapper from './date-time-wrapper.js'
 
 export default class Formatter {
+  static escapeHTML(input) {
+    const div = document.createElement('div')
+    div.appendChild(document.createTextNode(input))
+    return div.innerHTML
+  }
+
   static formatDate({ locale, timeZone, start, end, isShortOffsetNameShown }) {
     const startDateTime = new DateTimeWrapper({
       locale,
diff --git a/source/includes/EventsListBlock.php b/source/includes/EventsListBlock.php
index 3bdd25b..b376fa4 100644
--- a/source/includes/EventsListBlock.php
+++ b/source/includes/EventsListBlock.php
@@ -13,8 +13,8 @@ class EventsListBlock {
       ], '<wordpress-version>', array('in_footer' => true));
     register_block_type(NAME . '/events-list', [
       'api_version' => 2,
-      'title' => __('Events List', 'connector-mobilizon'),
-      'description' =>  __('A list of the upcoming events of the connected Mobilizon instance.', 'connector-mobilizon'),
+      'title' => esc_html__('Events List', 'connector-mobilizon'),
+      'description' =>  esc_html__('A list of the upcoming events of the connected Mobilizon instance.', 'connector-mobilizon'),
       'category' => 'widgets',
       'icon' => 'list-view',
       'supports' => [
diff --git a/source/includes/EventsListWidget.php b/source/includes/EventsListWidget.php
index 0726a7b..bfe0a62 100644
--- a/source/includes/EventsListWidget.php
+++ b/source/includes/EventsListWidget.php
@@ -6,9 +6,9 @@ class EventsListWidget extends \WP_Widget {
   public function __construct() {
     parent::__construct(
       NAME . '-events-list',
-      NICE_NAME . ' ' . __('Events List', 'connector-mobilizon'),
+      NICE_NAME . ' ' . esc_html__('Events List', 'connector-mobilizon'),
       array(
-        'description' => __('A list of the upcoming events of the connected Mobilizon instance.', 'connector-mobilizon'),
+        'description' => esc_html__('A list of the upcoming events of the connected Mobilizon instance.', 'connector-mobilizon'),
       ),
     );
   }
@@ -49,7 +49,7 @@ class EventsListWidget extends \WP_Widget {
   }
 
   public function form($options) {
-    $title = !empty($options['title']) ? $options['title'] : __('Events', 'connector-mobilizon');
+    $title = !empty($options['title']) ? $options['title'] : esc_html__('Events', 'connector-mobilizon');
     $eventsCount = !empty($options['eventsCount']) ? $options['eventsCount'] : DEFAULT_EVENTS_COUNT;
     $groupName = !empty($options['groupName']) ? $options['groupName'] : '';
     
diff --git a/source/includes/Settings.php b/source/includes/Settings.php
index 9b5feac..de33123 100644
--- a/source/includes/Settings.php
+++ b/source/includes/Settings.php
@@ -31,14 +31,14 @@ class Settings {
 
     add_settings_section(
       self::$SETTINGS_SECTION_NAME,
-      __('General Settings', 'connector-mobilizon'),
+      esc_html__('General Settings', 'connector-mobilizon'),
       '',
       self::$PAGE_NAME
     );
 
     add_settings_field(
       self::$SETTING_FIELD_NAME_URL,
-      __('URL', 'connector-mobilizon'),
+      esc_html__('URL', 'connector-mobilizon'),
       'MobilizonConnector\Settings::output_field_url',
       self::$PAGE_NAME,
       self::$SETTINGS_SECTION_NAME,
@@ -48,7 +48,7 @@ class Settings {
     );
     add_settings_field(
       self::$SETTING_FIELD_NAME_IS_SHORT_OFFSET_NAME_SHOWN,
-      __('Display named offset', 'connector-mobilizon'),
+      esc_html__('Display named offset', 'connector-mobilizon'),
       'MobilizonConnector\Settings::output_field_is_short_offset_name_shown',
       self::$PAGE_NAME,
       self::$SETTINGS_SECTION_NAME,
@@ -74,7 +74,7 @@ class Settings {
       add_settings_error(
         self::$OPTION_NAME_URL,
         'wordpress_mobilizon_field_url_error',
-        __('The URL is invalid.', 'connector-mobilizon'),
+        esc_html__('The URL is invalid.', 'connector-mobilizon'),
         'error'
       );
     }
@@ -86,7 +86,7 @@ class Settings {
 
   public static function register_settings_page() {
     add_options_page(
-      NICE_NAME . ' ' . __('Settings', 'connector-mobilizon'),
+      NICE_NAME . ' ' . esc_html__('Settings', 'connector-mobilizon'),
       NICE_NAME,
       'manage_options',
       NAME . '-settings',