diff --git a/classes/local/controllers/infopage.php b/classes/local/controllers/infopage.php
index acfe126..8e646bc 100644
--- a/classes/local/controllers/infopage.php
+++ b/classes/local/controllers/infopage.php
@@ -53,10 +53,14 @@ public function __construct(?array $params = null) {
         $CFG->svgicons = true;
 
         if (is_null($params)) {
+            $id = optional_param('id', null, PARAM_INT);
             $params = [
-                'id' => optional_param('id', null, PARAM_INT),
+                'id' => $id,
                 'outage' => null,
-                'static' => optional_param('static', false, PARAM_BOOL),
+                'static' => !is_null($id) && hash_equals(
+                    self::statickey($id),
+                    optional_param('statickey', '', PARAM_ALPHANUM)
+                ),
             ];
         } else {
             $defaults = [
@@ -152,4 +156,21 @@ private function set_parameters(array $params) {
         $this->outage = $params['outage'];
         $this->static = $params['static'];
     }
+
+    /**
+     * Computes the secret token that proves a request to view an outage's static
+     * rendering came from this plugin's own static-page generator, not an external
+     * client forging the request. Used to gate the 'static' flag (see constructor).
+     *
+     * @param int $outageid
+     * @return string
+     */
+    public static function statickey($outageid) {
+        $secret = get_config('auth_outage', 'staticsecret');
+        if (empty($secret)) {
+            $secret = random_string(64);
+            set_config('staticsecret', $secret, 'auth_outage');
+        }
+        return hash_hmac('sha256', (string)$outageid, $secret);
+    }
 }
diff --git a/classes/local/controllers/maintenance_static_page.php b/classes/local/controllers/maintenance_static_page.php
index 4a6896d..644bdf1 100644
--- a/classes/local/controllers/maintenance_static_page.php
+++ b/classes/local/controllers/maintenance_static_page.php
@@ -56,7 +56,8 @@ public static function create_from_outage($outage) {
                 header('X-Outage-EndTime: ' . $outage->stoptime);
             }
             $data = maintenance_static_page_io::file_get_data(
-                $CFG->wwwroot . '/auth/outage/info.php?auth_outage_hide_warning=1&static=1&id=' . $outage->id
+                $CFG->wwwroot . '/auth/outage/info.php?auth_outage_hide_warning=1&id=' . $outage->id
+                    . '&statickey=' . infopage::statickey($outage->id)
             );
             $html = $data['contents'];
         }
diff --git a/preview.php b/preview.php
index f2c2508..9a1d5a1 100644
--- a/preview.php
+++ b/preview.php
@@ -30,7 +30,11 @@
 
 // @codingStandardsIgnoreStart
 require_once(__DIR__.'/../../config.php');
+require_once($CFG->libdir . '/adminlib.php');
 // @codingStandardsIgnoreEnd
+
+admin_externalpage_setup('auth_outage_manage');
+
 $id = optional_param('id', null, PARAM_INT);
 $outage = is_null($id) ? outagedb::get_next_starting() : outagedb::get_by_id($id);
 if (is_null($outage)) {
diff --git a/version.php b/version.php
index df16521..a1ed2ed 100644
--- a/version.php
+++ b/version.php
@@ -28,8 +28,8 @@
 defined('MOODLE_INTERNAL') || die();
 
 $plugin->component = "auth_outage";
-$plugin->version = 2024081906;                  // The current plugin version (Date: YYYYMMDDXX).
-$plugin->release = 2024081906;                  // Human-readable release information.
+$plugin->version = 2024081907;                  // The current plugin version (Date: YYYYMMDDXX).
+$plugin->release = 2024081907;                  // Human-readable release information.
 $plugin->requires = 2017111309;                 // 2017111309 = T13, but this really requires 3.9 and higher.
 $plugin->maturity = MATURITY_STABLE;            // Suitable for PRODUCTION environments!
 $plugin->supported = [39, 405];                 // A range of branch numbers of supported moodle versions.
diff --git a/views/info/content.php b/views/info/content.php
index 8a01cef..1345c0a 100644
--- a/views/info/content.php
+++ b/views/info/content.php
@@ -39,7 +39,15 @@
         <b><?php echo get_string('infountil', 'auth_outage'); ?></b>
         <?php echo userdate($viewbag['outage']->stoptime, get_string('datetimeformat', 'auth_outage')); ?>
     </div>
-    <div class="auth_outage_info_description"><?php echo $viewbag['outage']->get_description(); ?></div>
+    <div class="auth_outage_info_description">
+        <?php
+        echo format_text(
+            $viewbag['outage']->get_description(),
+            FORMAT_HTML,
+            ['context' => context_system::instance()]
+        );
+        ?>
+    </div>
 
     <?php if ($viewbag['admin']) : ?>
         <?php