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-rw-r--r--synapse/rest/media/v1/download_resource.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/synapse/rest/media/v1/download_resource.py b/synapse/rest/media/v1/download_resource.py
index ca90964d1d..f911b120b1 100644
--- a/synapse/rest/media/v1/download_resource.py
+++ b/synapse/rest/media/v1/download_resource.py
@@ -52,6 +52,7 @@ class DownloadResource(Resource):
             b" script-src 'none';"
             b" plugin-types application/pdf;"
             b" style-src 'unsafe-inline';"
+            b" media-src 'self';"
             b" object-src 'self';"
         )
         server_name, media_id, name = parse_media_id(request)