diff --git a/README.md b/README.md
index 138e3f934..dfd1d7a27 100644
--- a/README.md
+++ b/README.md
@@ -147,6 +147,13 @@ https://www.youtube.com/watch?v=dJrykKQGDcs
 
 ## Changelog ##
 
+### 4.7.15
+
+* FIXED
+  * Fixed media ownership verification for activity updates with attached media.
+  * Fixed media ownership verification for comments on activities and single media.
+  * Fixed activity ownership verification and input sanitization on media upload endpoint.
+
 ### 4.7.14
 
 * FIXED
diff --git a/app/main/controllers/activity/RTMediaBuddyPressActivity.php b/app/main/controllers/activity/RTMediaBuddyPressActivity.php
index 1b0aa8693..d48930f30 100644
--- a/app/main/controllers/activity/RTMediaBuddyPressActivity.php
+++ b/app/main/controllers/activity/RTMediaBuddyPressActivity.php
@@ -506,7 +506,7 @@ public function bp_activity_content_before_save( $content, $class_obj ) {
 		}
 
 		$rtmedia_attached_files = filter_input( INPUT_POST, 'rtMedia_attached_files', FILTER_DEFAULT, FILTER_REQUIRE_ARRAY );
-		if ( ( ! empty( $rtmedia_attached_files ) ) && is_array( $rtmedia_attached_files ) ) {
+		if ( ( ! empty( $rtmedia_attached_files ) ) && is_array( $rtmedia_attached_files ) && rtmedia_is_media_owner( $rtmedia_attached_files ) ) {
 			$obj_activity = new RTMediaActivity( $rtmedia_attached_files, 0, $content );
 
 			// Remove action to fix duplication issue of comment content.
@@ -575,7 +575,7 @@ public function comment_sync( $comment_id, $param ) {
 			// has media in comment.
 			$rtmedia_attached_files = filter_input( INPUT_POST, 'rtMedia_attached_files', FILTER_DEFAULT, FILTER_REQUIRE_ARRAY );
 			// if the media is not empty.
-			if ( is_array( $rtmedia_attached_files ) && ! empty( $rtmedia_attached_files[0] ) && class_exists( 'RTMediaActivity' ) ) {
+			if ( is_array( $rtmedia_attached_files ) && ! empty( $rtmedia_attached_files ) && class_exists( 'RTMediaActivity' ) && rtmedia_is_media_owner( $rtmedia_attached_files, $user_id ) ) {
 				// create new html for comment content.
 				$obj_comment      = new RTMediaActivity( $rtmedia_attached_files[0], 0, $param['content'] );
 				$param['content'] = $obj_comment->create_activity_html( 'comment-media' );
@@ -622,13 +622,13 @@ public function bp_activity_posted_update( $content, $user_id, $activity_id ) {
 		do_action( 'rtmedia_bp_before_activity_posted', $content, $user_id, $activity_id );
 
 		$rtmedia_attached_files = filter_input( INPUT_POST, 'rtMedia_attached_files', FILTER_DEFAULT, FILTER_REQUIRE_ARRAY );
-		if ( is_array( $rtmedia_attached_files ) ) {
+		if ( is_array( $rtmedia_attached_files ) && ! empty( $rtmedia_attached_files ) ) {
 			bp_activity_update_meta( $activity_id, 'bp_activity_text', bp_activity_filter_kses( $content ) );
 			$media_obj = new RTMediaModel();
 			// Credit faisal : https://gist.github.com/faishal/c4306ae7267fff976465.
 			$in_str_arr    = array_fill( 0, count( $rtmedia_attached_files ), '%d' );
 			$in_str        = join( ',', $in_str_arr );
-			$sql           = $wpdb->prepare( "update {$media_obj->table_name} set activity_id = %d where blog_id = %d and ", $activity_id, get_current_blog_id() ); // phpcs:ignore
+			$sql           = $wpdb->prepare( "update {$media_obj->table_name} set activity_id = %d where blog_id = %d and media_author = %d and ", $activity_id, get_current_blog_id(), $user_id ); // phpcs:ignore
 			$form_id_where = $wpdb->prepare( "id IN ($in_str)", $rtmedia_attached_files ); // phpcs:ignore
 			$sql          .= $form_id_where;
 			$wpdb->query( $sql ); // phpcs:ignore
@@ -1226,7 +1226,7 @@ public function activity_after_media_comment( $params ) {
 						$rtmedia_attached_files = filter_input( INPUT_POST, 'rtMedia_attached_files', FILTER_DEFAULT, FILTER_REQUIRE_ARRAY );
 
 						// check media should be in array format and is not empty to.
-						if ( ! empty( $rtmedia_attached_files ) && class_exists( 'RTMediaActivity' ) && is_array( $rtmedia_attached_files ) ) {
+						if ( ! empty( $rtmedia_attached_files ) && class_exists( 'RTMediaActivity' ) && is_array( $rtmedia_attached_files ) && rtmedia_is_media_owner( $rtmedia_attached_files, $user_id ) ) {
 							$comment_media    = true;
 							$comment_media_id = $rtmedia_attached_files[0];
 							$obj_comment      = new RTMediaActivity( $rtmedia_attached_files[0], 0, $comment_content );
diff --git a/app/main/controllers/media/RTMediaComment.php b/app/main/controllers/media/RTMediaComment.php
index 1132b4d1d..c9862145f 100755
--- a/app/main/controllers/media/RTMediaComment.php
+++ b/app/main/controllers/media/RTMediaComment.php
@@ -100,7 +100,7 @@ public function add( $attr ) {
 		$rtmedia_attached_files = filter_input( INPUT_POST, 'rtMedia_attached_files', FILTER_DEFAULT, FILTER_REQUIRE_ARRAY );
 
 		// add comment id in the rtmedia meta fields.
-		if ( ! empty( $rtmedia_attached_files ) && is_array( $rtmedia_attached_files ) ) {
+		if ( ! empty( $rtmedia_attached_files ) && is_array( $rtmedia_attached_files ) && function_exists( 'rtmedia_is_media_owner' ) && rtmedia_is_media_owner( $rtmedia_attached_files ) ) {
 			add_rtmedia_meta( $rtmedia_attached_files[0], 'rtmedia_comment_media_comment_id', $id );
 		}
 
diff --git a/app/main/controllers/template/RTMediaTemplate.php b/app/main/controllers/template/RTMediaTemplate.php
index c058aee2f..37f447c14 100755
--- a/app/main/controllers/template/RTMediaTemplate.php
+++ b/app/main/controllers/template/RTMediaTemplate.php
@@ -894,12 +894,17 @@ public function check_return_comments() {
 				}
 
 				if ( ! empty( $rtmedia_attached_files ) ) {
-					// has media.
-					$comment_with_media = true;
-
-					// create new html for comment content.
-					$obj_comment     = new RTMediaActivity( $rtmedia_attached_files[0], 0, $comment_content );
-					$comment_content = $obj_comment->create_activity_html( 'comment-media' );
+					if ( rtmedia_is_media_owner( $rtmedia_attached_files ) ) {
+						// has media.
+						$comment_with_media = true;
+
+						// create new html for comment content.
+						$obj_comment     = new RTMediaActivity( $rtmedia_attached_files[0], 0, $comment_content );
+						$comment_content = $obj_comment->create_activity_html( 'comment-media' );
+					} else {
+						unset( $_POST['rtMedia_attached_files'] );
+						$rtmedia_attached_files = array();
+					}
 				}
 
 				$comment = new RTMediaComment();
diff --git a/app/main/controllers/template/rtmedia-ajax-actions.php b/app/main/controllers/template/rtmedia-ajax-actions.php
index 0bc651303..6034e39b9 100644
--- a/app/main/controllers/template/rtmedia-ajax-actions.php
+++ b/app/main/controllers/template/rtmedia-ajax-actions.php
@@ -214,24 +214,25 @@ function rtmedia_bp_activity_after_save_callback( $activity_data ) {
 
 		// check if class exits or not and it has any media in it.
 		if ( ! empty( $rtmedia_attached_files ) && isset( $activity_data->id ) && is_array( $rtmedia_attached_files ) && ! empty( $rtmedia_attached_files[0] ) && class_exists( 'RTMediaModel' ) ) {
+			if ( rtmedia_is_media_owner( $rtmedia_attached_files ) ) {
+				if ( function_exists( 'rtmedia_get_original_comment_media_content' ) ) {
+					// get the original content of media.
+					$original_content = rtmedia_get_original_comment_media_content();
+					// save the original content in the meta fields.
+					bp_activity_update_meta( $activity_data->id, 'bp_activity_text', $original_content );
+				}
 
-			if ( function_exists( 'rtmedia_get_original_comment_media_content' ) ) {
-				// get the original content of media.
-				$original_content = rtmedia_get_original_comment_media_content();
-				// save the original content in the meta fields.
-				bp_activity_update_meta( $activity_data->id, 'bp_activity_text', $original_content );
+				$rtmedia_model = new RTMediaModel();
+				$rtmedia_model->update(
+					array(
+						'activity_id' => $activity_data->id,
+					),
+					array(
+						'id' => $rtmedia_attached_files[0],
+					)
+				);
 			}
 
-			$rtmedia_model = new RTMediaModel();
-			$rtmedia_model->update(
-				array(
-					'activity_id' => $activity_data->id,
-				),
-				array(
-					'id' => $rtmedia_attached_files[0],
-				)
-			);
-
 			$privacy = -1;
 			$form_id = filter_input( INPUT_POST, 'form_id', FILTER_SANITIZE_NUMBER_INT );
 
@@ -289,7 +290,7 @@ function rtmedia_bp_activity_comment_content_callback( $content ) {
 
 	if ( ! empty( $rtmedia_attached_files ) && ! empty( $comment_id ) && ! empty( $form_id ) ) {
 
-		if ( ! empty( $rtmedia_attached_files[0] ) && is_array( $rtmedia_attached_files ) && class_exists( 'RTMediaActivity' ) ) {
+		if ( ! empty( $rtmedia_attached_files[0] ) && is_array( $rtmedia_attached_files ) && class_exists( 'RTMediaActivity' ) && rtmedia_is_media_owner( $rtmedia_attached_files ) ) {
 			$obj_comment = new RTMediaActivity( $rtmedia_attached_files[0], 0, $content );
 			$new_content = $obj_comment->create_activity_html();
 		}
diff --git a/app/main/controllers/template/rtmedia-functions.php b/app/main/controllers/template/rtmedia-functions.php
index 9261f87c1..623761ed3 100644
--- a/app/main/controllers/template/rtmedia-functions.php
+++ b/app/main/controllers/template/rtmedia-functions.php
@@ -5394,3 +5394,47 @@ function rtmedia_like_eraser( $email_address, $page = 1 ) {
 		'done'           => $done,
 	);
 }
+
+/**
+ * Check if the given user owns the specified media.
+ *
+ * @param int|array $media_id Media ID or array of Media IDs.
+ * @param int       $user_id  Optional. User ID. Defaults to current logged-in user.
+ *
+ * @return bool True if media exists and author matches user ID, false otherwise.
+ */
+function rtmedia_is_media_owner( $media_id, $user_id = 0 ) {
+	if ( empty( $media_id ) ) {
+		return false;
+	}
+
+	$user_id = ! empty( $user_id ) ? intval( $user_id ) : get_current_user_id();
+	if ( empty( $user_id ) ) {
+		return false;
+	}
+
+	// Normalize input to a unique array of valid integer IDs.
+	$media_ids = is_array( $media_id ) ? $media_id : array( $media_id );
+	$media_ids = array_filter( array_map( 'intval', $media_ids ) );
+	$media_ids = array_unique( $media_ids );
+
+	if ( empty( $media_ids ) ) {
+		return false;
+	}
+
+	$model = new RTMediaModel();
+	$media = $model->get( array( 'id' => $media_ids ) );
+
+	if ( count( $media ) !== count( $media_ids ) ) {
+		return false;
+	}
+
+	foreach ( $media as $item ) {
+		if ( intval( $item->media_author ) !== $user_id ) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
diff --git a/app/main/controllers/upload/RTMediaUploadEndpoint.php b/app/main/controllers/upload/RTMediaUploadEndpoint.php
index fa2d1b6fb..5e5f6636a 100755
--- a/app/main/controllers/upload/RTMediaUploadEndpoint.php
+++ b/app/main/controllers/upload/RTMediaUploadEndpoint.php
@@ -86,11 +86,22 @@ public function template_redirect( $create_activity = true ) {
 				$model = new RTMediaUploadModel();
 				do_action( 'rtmedia_upload_set_post_object' );
 				$this->upload = $model->set_post_object();
+				unset( $this->upload['activity_id'] );
+
+				if ( -1 !== $_activity_id && ! empty( $_activity_id ) ) {
+					$can_attach = false;
+					// Query the activity to check if the activity belongs to the user.
+					if ( is_user_logged_in() && function_exists( 'bp_activity_get_specific' ) ) {
+						$activity = bp_activity_get_specific( array( 'activity_ids' => array( intval( $_activity_id ) ) ) );
+						if ( ! empty( $activity['activities'][0] ) && intval( $activity['activities'][0]->user_id ) === get_current_user_id() ) {
+							$can_attach = true;
+						}
+					}
 
-				if ( -1 !== $_activity_id ) {
-					$this->upload['activity_id'] = $_activity_id;
-					$activity_id                 = $_activity_id;
-
+					if ( $can_attach ) {
+						$this->upload['activity_id'] = $_activity_id;
+						$activity_id                 = $_activity_id;
+					}
 				}
 
 				// Media uploaded into a group takes its privacy from that group.
diff --git a/changelog.txt b/changelog.txt
index aa271b3c2..753f122a0 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,5 +1,13 @@
 == Changelog ==
 
+= 4.7.15 [October 13, 2026] =
+
+* FIXED
+  * Fixed media ownership verification for activity updates with attached media.
+  * Fixed media ownership verification for comments on activities and single media.
+  * Fixed activity ownership verification and input sanitization on media upload endpoint.
+
+
 = 4.7.14 [October 06, 2026] =
 
 * FIXED
diff --git a/index.php b/index.php
index 49d8c439e..a1da0a583 100644
--- a/index.php
+++ b/index.php
@@ -3,7 +3,7 @@
  * Plugin Name: rtMedia for WordPress, BuddyPress and bbPress
  * Plugin URI: https://rtmedia.io/?utm_source=dashboard&utm_medium=plugin&utm_campaign=buddypress-media
  * Description: This plugin adds missing media rich features like photos, videos and audio uploading to BuddyPress which are essential if you are building social network, seriously!
- * Version: 4.7.14
+ * Version: 4.7.15
  * Requires at least: 4.9.6
  * Text Domain: buddypress-media
  * Author: rtCamp
@@ -26,7 +26,7 @@
 	/**
 	 * The version of the plugin
 	 */
-	define( 'RTMEDIA_VERSION', '4.7.14' );
+	define( 'RTMEDIA_VERSION', '4.7.15' );
 }
 
 if ( ! defined( 'RTMEDIA_PATH' ) ) {
diff --git a/languages/buddpress-media.pot b/languages/buddpress-media.pot
index f50f35459..2f97e1f3f 100644
--- a/languages/buddpress-media.pot
+++ b/languages/buddpress-media.pot
@@ -2,14 +2,14 @@
 # This file is distributed under the GPLv2 or later.
 msgid ""
 msgstr ""
-"Project-Id-Version: rtMedia for WordPress, BuddyPress and bbPress 4.7.14\n"
+"Project-Id-Version: rtMedia for WordPress, BuddyPress and bbPress 4.7.15\n"
 "Report-Msgid-Bugs-To: https://wordpress.org/support/plugin/buddypress-media\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"POT-Creation-Date: 2026-10-01T07:41:26+00:00\n"
+"POT-Creation-Date: 2026-10-13T06:23:39+00:00\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "X-Generator: WP-CLI 2.12.0\n"
 "X-Domain: buddypress-media\n"
@@ -2220,7 +2220,7 @@ msgstr ""
 #. translators: 1: Username, 2: Number of medias, 3: Media slug.
 #: app/main/controllers/activity/RTMediaBuddyPressActivity.php:988
 #: app/main/controllers/activity/RTMediaBuddyPressActivity.php:991
-#: app/main/controllers/upload/RTMediaUploadEndpoint.php:283
+#: app/main/controllers/upload/RTMediaUploadEndpoint.php:294
 #, php-format
 msgid "%1$s added %2$d %3$s"
 msgstr ""
@@ -3019,18 +3019,18 @@ msgstr ""
 msgid "Invalid attribute passed for rtmedia_gallery shortcode."
 msgstr ""
 
-#: app/main/controllers/template/RTMediaTemplate.php:472
-#: app/main/controllers/template/RTMediaTemplate.php:612
-#: app/main/controllers/template/RTMediaTemplate.php:735
-#: app/main/controllers/template/RTMediaTemplate.php:975
+#: app/main/controllers/template/RTMediaTemplate.php:486
+#: app/main/controllers/template/RTMediaTemplate.php:627
+#: app/main/controllers/template/RTMediaTemplate.php:750
+#: app/main/controllers/template/RTMediaTemplate.php:995
 msgid "Ooops !!! Invalid access. No nonce was found !!"
 msgstr ""
 
-#: app/main/controllers/template/RTMediaTemplate.php:482
+#: app/main/controllers/template/RTMediaTemplate.php:496
 msgid "Media updated Successfully"
 msgstr ""
 
-#: app/main/controllers/template/RTMediaTemplate.php:501
+#: app/main/controllers/template/RTMediaTemplate.php:515
 msgid "Error in updating Media"
 msgstr ""
 
diff --git a/languages/buddypress-media.pot b/languages/buddypress-media.pot
index f50f35459..2f97e1f3f 100644
--- a/languages/buddypress-media.pot
+++ b/languages/buddypress-media.pot
@@ -2,14 +2,14 @@
 # This file is distributed under the GPLv2 or later.
 msgid ""
 msgstr ""
-"Project-Id-Version: rtMedia for WordPress, BuddyPress and bbPress 4.7.14\n"
+"Project-Id-Version: rtMedia for WordPress, BuddyPress and bbPress 4.7.15\n"
 "Report-Msgid-Bugs-To: https://wordpress.org/support/plugin/buddypress-media\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"POT-Creation-Date: 2026-10-01T07:41:26+00:00\n"
+"POT-Creation-Date: 2026-10-13T06:23:39+00:00\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "X-Generator: WP-CLI 2.12.0\n"
 "X-Domain: buddypress-media\n"
@@ -2220,7 +2220,7 @@ msgstr ""
 #. translators: 1: Username, 2: Number of medias, 3: Media slug.
 #: app/main/controllers/activity/RTMediaBuddyPressActivity.php:988
 #: app/main/controllers/activity/RTMediaBuddyPressActivity.php:991
-#: app/main/controllers/upload/RTMediaUploadEndpoint.php:283
+#: app/main/controllers/upload/RTMediaUploadEndpoint.php:294
 #, php-format
 msgid "%1$s added %2$d %3$s"
 msgstr ""
@@ -3019,18 +3019,18 @@ msgstr ""
 msgid "Invalid attribute passed for rtmedia_gallery shortcode."
 msgstr ""
 
-#: app/main/controllers/template/RTMediaTemplate.php:472
-#: app/main/controllers/template/RTMediaTemplate.php:612
-#: app/main/controllers/template/RTMediaTemplate.php:735
-#: app/main/controllers/template/RTMediaTemplate.php:975
+#: app/main/controllers/template/RTMediaTemplate.php:486
+#: app/main/controllers/template/RTMediaTemplate.php:627
+#: app/main/controllers/template/RTMediaTemplate.php:750
+#: app/main/controllers/template/RTMediaTemplate.php:995
 msgid "Ooops !!! Invalid access. No nonce was found !!"
 msgstr ""
 
-#: app/main/controllers/template/RTMediaTemplate.php:482
+#: app/main/controllers/template/RTMediaTemplate.php:496
 msgid "Media updated Successfully"
 msgstr ""
 
-#: app/main/controllers/template/RTMediaTemplate.php:501
+#: app/main/controllers/template/RTMediaTemplate.php:515
 msgid "Error in updating Media"
 msgstr ""
 
diff --git a/readme.txt b/readme.txt
index bfa5e285a..431b0d80b 100644
--- a/readme.txt
+++ b/readme.txt
@@ -5,7 +5,7 @@ License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
 Requires at least: 4.9.6
 Tested up to: 7.0
-Stable tag: 4.7.14
+Stable tag: 4.7.15
 
 Add albums, photo, audio/video upload, privacy, sharing, front-end uploads & more. All this works on mobile/tablets devices.
 
@@ -128,6 +128,13 @@ http://www.youtube.com/watch?v=dJrykKQGDcs
 
 == Changelog ==
 
+= 4.7.15 [October 13, 2026] =
+
+* FIXED
+  * Fixed media ownership verification for activity updates with attached media.
+  * Fixed media ownership verification for comments on activities and single media.
+  * Fixed activity ownership verification and input sanitization on media upload endpoint.
+
 = 4.7.14 [October 06, 2026] =
 
 * FIXED
@@ -1034,6 +1041,9 @@ http://www.youtube.com/watch?v=dJrykKQGDcs
 
 == Upgrade Notice ==
 
+= 4.7.15 =
+This release includes important security improvements for media ownership verification and upload endpoint activity authorization. We strongly recommend upgrading.
+
 = 4.7.14 =
 This release includes important security improvements for media uploads, file extension validation and media edit authorization. We strongly recommend upgrading.