diff --git a/core/app/Http/Controllers/InboxController.php b/core/app/Http/Controllers/InboxController.php
index 7b4e073..0b12e8f 100644
--- a/core/app/Http/Controllers/InboxController.php
+++ b/core/app/Http/Controllers/InboxController.php
@@ -70,7 +70,7 @@ class InboxController extends Controller
             'state' => $e->state->value,
             'title' => $e->payload['title'],
             'subtitle' => $e->payload['subtitle'] ?? null,
-            'link' => $e->payload['deep_link'] ?? null,
+            'link' => self::safeLink($e->payload['deep_link'] ?? null),
             'done_label' => $e->payload['done_label'] ?? 'Сделано',
             'can_remind' => $e->state !== EventState::Scheduled,
             'source' => self::sourceLabel($e->source->name),
@@ -88,6 +88,12 @@ class InboxController extends Controller
         return $name === 'manual' ? 'вручную' : $name;
     }
 
+    /** Пропускает только относительные пути и http(s)-ссылки; прочее (напр. javascript:) отбрасывает. */
+    public static function safeLink(?string $link): ?string
+    {
+        return $link !== null && preg_match('#^(/|https?://)#i', $link) === 1 ? $link : null;
+    }
+
     public static function relative(int $diff): string
     {
         $days = fn (int $n) => $n % 10 === 1 && $n % 100 !== 11 ? 'день' : ($n % 10 >= 2 && $n % 10 <= 4 && ($n % 100 < 12 || $n % 100 > 14) ? 'дня' : 'дней');
diff --git a/core/app/Http/Requests/UpsertEventsRequest.php b/core/app/Http/Requests/UpsertEventsRequest.php
index aa093a2..3f3eb5a 100644
--- a/core/app/Http/Requests/UpsertEventsRequest.php
+++ b/core/app/Http/Requests/UpsertEventsRequest.php
@@ -27,11 +27,18 @@ class UpsertEventsRequest extends FormRequest
             'events.*.payload' => ['required', 'array'],
             'events.*.payload.title' => ['required', 'string'],
             'events.*.payload.subtitle' => ['sometimes', 'nullable', 'string'],
-            'events.*.payload.deep_link' => ['sometimes', 'nullable', 'string'],
+            'events.*.payload.deep_link' => ['sometimes', 'nullable', 'string', 'max:2048', 'regex:#^(/|https?://)#'],
             'events.*.payload.done_label' => ['sometimes', 'nullable', 'string', 'max:64'],
         ];
     }
 
+    public function messages(): array
+    {
+        return [
+            'events.*.payload.deep_link.regex' => 'deep_link должен быть относительным путём или http(s)-ссылкой',
+        ];
+    }
+
     public function after(): array
     {
         return [function (Validator $v) {
diff --git a/core/tests/Feature/ClientApiTest.php b/core/tests/Feature/ClientApiTest.php
index d8b2ea8..fa09ed2 100644
--- a/core/tests/Feature/ClientApiTest.php
+++ b/core/tests/Feature/ClientApiTest.php
@@ -83,6 +83,19 @@ class ClientApiTest extends TestCase
             ->assertStatus(422)->assertJsonValidationErrors(['events']);
     }
 
+    public function test_deep_link_must_be_relative_or_http(): void
+    {
+        $bad = $this->item(['payload' => ['title' => 'x', 'deep_link' => 'javascript:alert(1)']]);
+        $this->putJson('/api/events', ['events' => [$bad]], $this->auth())
+            ->assertStatus(422)->assertJsonValidationErrors(['events.0.payload.deep_link']);
+
+        $ok1 = $this->item(['payload' => ['title' => 'x', 'deep_link' => '/people/42']]);
+        $this->putJson('/api/events', ['events' => [$ok1]], $this->auth())->assertOk();
+
+        $ok2 = $this->item(['topic' => 'birthday:2027', 'payload' => ['title' => 'x', 'deep_link' => 'https://docs.example/x']]);
+        $this->putJson('/api/events', ['events' => [$ok2]], $this->auth())->assertOk();
+    }
+
     public function test_topic_defaults_to_empty_string(): void
     {
         $item = $this->item();
diff --git a/core/tests/Feature/InboxPageTest.php b/core/tests/Feature/InboxPageTest.php
index 9016a45..76f32ad 100644
--- a/core/tests/Feature/InboxPageTest.php
+++ b/core/tests/Feature/InboxPageTest.php
@@ -88,4 +88,22 @@ class InboxPageTest extends TestCase
         $this->assertStringContainsString('<title>Hado</title>', $html);
         $this->assertStringNotContainsString('class="counter"', $html);
     }
+
+    public function test_unsafe_deep_link_is_not_rendered_as_href(): void
+    {
+        $this->get('/', ['X-Remote-User' => 'nikita']);
+        $user = User::sole();
+        $source = Source::create(['name' => 'docs', 'token_hash' => hash('sha256', 'x')]);
+        Event::create([
+            'source_id' => $source->id, 'user_id' => $user->id, 'source_ref' => 'r', 'topic' => 'a',
+            'due_mode' => DueMode::Local, 'due_date' => '2026-09-04', 'due_time' => '24:00:00', 'fire_on' => '2026-09-04',
+            'after_due' => AfterDue::Keep, 'payload' => ['title' => 'Опасное событие', 'deep_link' => 'javascript:alert(1)'],
+            'state' => EventState::Today, 'quiet_until' => CarbonImmutable::parse('2000-01-01Z'),
+        ]);
+
+        $html = $this->get('/', ['X-Remote-User' => 'nikita'])->assertOk()->getContent();
+
+        $this->assertStringNotContainsString('href="javascript:', $html);
+        $this->assertStringContainsString('Опасное событие', $html);
+    }
 }