diff --git a/src/Service/VideoManager.php b/src/Service/VideoManager.php
index 005947425..31a30567d 100644
--- a/src/Service/VideoManager.php
+++ b/src/Service/VideoManager.php
@@ -7,6 +7,7 @@
 class VideoManager
 {
     public const VIDEO_MIMETYPES = ['video/mp4', 'video/webm'];
+    public const UNSUPPORTED_STREAM_EXTENSIONS = ['m3u8', 'm3u', 'mpd', 'ism', 'isml'];
 
     public static function isVideoUrl(string $url): bool
     {
@@ -22,6 +23,18 @@ public static function isVideoUrl(string $url): bool
         return \in_array($urlExt, $types, false);
     }
 
+    public static function isUnsupportedStreamUrl(string $url): bool
+    {
+        if (str_starts_with($url, 'data:')) {
+            return false;
+        }
+
+        $path = (string) parse_url($url, PHP_URL_PATH);
+        $urlExt = strtolower(pathinfo($path, PATHINFO_EXTENSION));
+
+        return \in_array($urlExt, self::UNSUPPORTED_STREAM_EXTENSIONS, true);
+    }
+
     public static function isSupportedVideoMimeType(?string $mimeType): bool
     {
         if (null === $mimeType || '' === trim($mimeType)) {
diff --git a/src/Utils/Embed.php b/src/Utils/Embed.php
index 448ab8aea..aa4b11cd4 100644
--- a/src/Utils/Embed.php
+++ b/src/Utils/Embed.php
@@ -154,6 +154,7 @@ private function cleanIframe(?string $html): ?string
         libxml_clear_errors();
 
         $videoElements = $dom->getElementsByTagName('video');
+        $iframeElements = $dom->getElementsByTagName('iframe');
 
         foreach ($videoElements as $videoElement) {
             $sourceUrl = $videoElement->getAttribute('src');
@@ -186,6 +187,20 @@ private function cleanIframe(?string $html): ?string
             }
         }
 
+        foreach ($iframeElements as $iframeElement) {
+            $iframeSrc = $iframeElement->getAttribute('src');
+
+            if (
+                $iframeSrc
+                && (
+                    VideoManager::isVideoUrl($iframeSrc)
+                    || VideoManager::isUnsupportedStreamUrl($iframeSrc)
+                )
+            ) {
+                return null;
+            }
+        }
+
         return $html;
     }
 
diff --git a/tests/Unit/Utils/EmbedTest.php b/tests/Unit/Utils/EmbedTest.php
index b4e698781..77f422123 100644
--- a/tests/Unit/Utils/EmbedTest.php
+++ b/tests/Unit/Utils/EmbedTest.php
@@ -53,6 +53,36 @@ public function testUnsupportedVideoContentWithOtherMarkupIsRejected(): void
         self::assertNull($method->invoke($embed, $html));
     }
 
+    public function testUnsupportedIframeStreamUrlIsRejected(): void
+    {
+        $embed = $this->createEmbed();
+        $method = new \ReflectionMethod(Embed::class, 'cleanIframe');
+
+        $html = '<iframe src="https://www.cbsnews.com/mediaplayer/video/master.m3u8" allowfullscreen></iframe>';
+
+        self::assertNull($method->invoke($embed, $html));
+    }
+
+    public function testIframeVideoUrlIsRejected(): void
+    {
+        $embed = $this->createEmbed();
+        $method = new \ReflectionMethod(Embed::class, 'cleanIframe');
+
+        $html = '<iframe src="https://example.com/video.mp4" allowfullscreen></iframe>';
+
+        self::assertNull($method->invoke($embed, $html));
+    }
+
+    public function testSupportedIframeEmbedUrlIsKept(): void
+    {
+        $embed = $this->createEmbed();
+        $method = new \ReflectionMethod(Embed::class, 'cleanIframe');
+
+        $html = '<iframe src="https://www.youtube.com/embed/abc123" allowfullscreen></iframe>';
+
+        self::assertSame($html, $method->invoke($embed, $html));
+    }
+
     private function createEmbed(): Embed
     {
         return new Embed(