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-rw-r--r--lib/private/eventsource.php11
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/private/eventsource.php b/lib/private/eventsource.php
index c69671c1a75..e2be808e726 100644
--- a/lib/private/eventsource.php
+++ b/lib/private/eventsource.php
@@ -59,6 +59,17 @@ class OC_EventSource implements \OCP\IEventSource {
$this->fallback = isset($_GET['fallback']) and $_GET['fallback'] == 'true';
if ($this->fallback) {
$this->fallBackId = (int)$_GET['fallback_id'];
+ /**
+ * FIXME: The default content-security-policy of ownCloud forbids inline
+ * JavaScript for security reasons. IE starting on Windows 10 will
+ * however also obey the CSP which will break the event source fallback.
+ *
+ * As a workaround thus we set a custom policy which allows the execution
+ * of inline JavaScript.
+ *
+ * @link https://github.com/owncloud/core/issues/14286
+ */
+ header("Content-Security-Policy: default-src 'none'; script-src 'unsafe-inline'");
header("Content-Type: text/html");
echo str_repeat('<span></span>' . PHP_EOL, 10); //dummy data to keep IE happy
} else {