diff --git a/.upgradenotes/MDL-87280-2025121211100178.yml b/.upgradenotes/MDL-87280-2025121211100178.yml
new file mode 100644
index 00000000000..2b4a417d750
--- /dev/null
+++ b/.upgradenotes/MDL-87280-2025121211100178.yml
@@ -0,0 +1,8 @@
+issueNumber: MDL-87280
+notes:
+  mod_subsection:
+    - message: >-
+        A new scheduled task, `remove_existing_descriptions`, has been added.
+        Once enabled, this task will remove the descriptions for all existing
+        subsection instances.
+      type: improved
diff --git a/public/mod/subsection/classes/task/remove_existing_descriptions_task.php b/public/mod/subsection/classes/task/remove_existing_descriptions_task.php
new file mode 100644
index 00000000000..c4515cc5b11
--- /dev/null
+++ b/public/mod/subsection/classes/task/remove_existing_descriptions_task.php
@@ -0,0 +1,46 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+namespace mod_subsection\task;
+
+use core\task\scheduled_task;
+
+/**
+ * A scheduled task to remove existing descriptions from subsection instances.
+ *
+ * @package    mod_subsection
+ * @copyright  2025 Sara Arjona <sara@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class remove_existing_descriptions_task extends scheduled_task {
+    /**
+     * Return the task name.
+     *
+     * @return string The name of the task.
+     */
+    public function get_name(): string {
+        return get_string('removeexistingdescriptions', 'mod_subsection');
+    }
+
+    /**
+     * Execute the task.
+     */
+    public function execute(): void {
+        global $DB;
+
+        $DB->set_field('course_sections', 'summary', '', ['component' => 'mod_subsection']);
+    }
+}
diff --git a/public/mod/subsection/db/tasks.php b/public/mod/subsection/db/tasks.php
new file mode 100644
index 00000000000..7a78fbc02a5
--- /dev/null
+++ b/public/mod/subsection/db/tasks.php
@@ -0,0 +1,39 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Definition of Subsection scheduled tasks.
+ *
+ * @package   mod_subsection
+ * @category  task
+ * @copyright 2025 Sara Arjona <sara@moodle.com>
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+$tasks = [
+    [
+        'classname' => '\mod_subsection\task\remove_existing_descriptions_task',
+        'blocking' => 0,
+        'minute' => 'R',
+        'hour' => '0',
+        'day' => '*',
+        'dayofweek' => '*',
+        'month' => '*',
+        'disabled' => true,
+    ],
+];
diff --git a/public/mod/subsection/lang/en/subsection.php b/public/mod/subsection/lang/en/subsection.php
index 3893fbe662a..4989639fcb5 100644
--- a/public/mod/subsection/lang/en/subsection.php
+++ b/public/mod/subsection/lang/en/subsection.php
@@ -29,6 +29,7 @@ $string['pluginadministration'] = 'Subsection administration';
 $string['pluginname'] = 'Subsection';
 $string['privacy:metadata'] = 'Subsection does not store any personal data';
 $string['quickcreatename'] = 'New subsection';
+$string['removeexistingdescriptions'] = 'Remove existing descriptions from subsection instances';
 $string['subsection:addinstance'] = 'Add subsection';
 $string['subsection:view'] = 'View subsection';
 $string['subsectionname'] = 'Name';
diff --git a/public/mod/subsection/tests/task/remove_existing_descriptions_task_test.php b/public/mod/subsection/tests/task/remove_existing_descriptions_task_test.php
new file mode 100644
index 00000000000..f1ea59fc1bc
--- /dev/null
+++ b/public/mod/subsection/tests/task/remove_existing_descriptions_task_test.php
@@ -0,0 +1,99 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+namespace mod_subsection\task;
+
+/**
+ * Class containing unit tests for the remove existing descriptions task.
+ *
+ * @package   mod_subsection
+ * @copyright 2025 Sara Arjona <sara@moodle.com>
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+#[\PHPUnit\Framework\Attributes\CoversClass(remove_existing_descriptions_task::class)]
+final class remove_existing_descriptions_task_test extends \advanced_testcase {
+    /**
+     * Test remove_existing_descriptions task.
+     */
+    public function test_remove_existing_descriptions(): void {
+        global $DB;
+
+        $this->resetAfterTest();
+
+        $course = $this->getDataGenerator()->create_course(['format' => 'topics', 'numsections' => 1]);
+        $this->getDataGenerator()->create_module('subsection', ['course' => $course->id, 'section' => 1]);
+        // Add description to course sections and the subsection.
+        $DB->set_field(
+            'course_sections',
+            'summary',
+            'Section with description',
+            ['course' => $course->id],
+        );
+        // Add another subsection without description.
+        $this->getDataGenerator()->create_module('subsection', ['course' => $course->id, 'section' => 1]);
+
+        // Check only 2 sections and 1 subsection have description.
+        $this->assertEquals(
+            3,
+            $DB->count_records_select(
+                'course_sections',
+                'course = :courseid AND summary != \'\'',
+                ['courseid' => $course->id],
+            ),
+        );
+        $this->assertEquals(
+            2,
+            $DB->count_records_select(
+                'course_sections',
+                'course = :courseid AND component = \'mod_subsection\'',
+                ['courseid' => $course->id],
+            ),
+        );
+        $this->assertEquals(
+            1,
+            $DB->count_records_select(
+                'course_sections',
+                'course = :courseid  AND component = \'mod_subsection\' AND summary != \'\'',
+                ['courseid' => $course->id],
+            ),
+        );
+
+        // Run the task.
+        ob_start();
+        $task = new remove_existing_descriptions_task();
+        $task->execute();
+        ob_end_clean();
+
+        // Check only 2 sections keep having description after running the task.
+        $this->assertEquals(
+            2,
+            $DB->count_records_select(
+                'course_sections',
+                'course = :courseid AND summary != \'\'',
+                ['courseid' => $course->id],
+            ),
+        );
+        // Check no subsection has description after running the task.
+        $this->assertEquals(
+            0,
+            $DB->count_records_select(
+                'course_sections',
+                'course = :courseid  AND component = \'mod_subsection\' AND summary != \'\'',
+                ['courseid' => $course->id],
+            ),
+        );
+    }
+}
diff --git a/public/mod/subsection/version.php b/public/mod/subsection/version.php
index 59403937cd8..e1592e53f6d 100644
--- a/public/mod/subsection/version.php
+++ b/public/mod/subsection/version.php
@@ -25,6 +25,6 @@
 defined('MOODLE_INTERNAL') || die();
 
 $plugin->component = 'mod_subsection';
-$plugin->version = 2025100600;
+$plugin->version = 2025100601;
 $plugin->requires = 2025092600;
 $plugin->maturity = MATURITY_STABLE;