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-rw-r--r--core/js/js.js14
1 files changed, 14 insertions, 0 deletions
diff --git a/core/js/js.js b/core/js/js.js
index 8d3756ae2ec..de773dc1221 100644
--- a/core/js/js.js
+++ b/core/js/js.js
@@ -1215,6 +1215,20 @@ function object(o) {
* Initializes core
*/
function initCore() {
+ /**
+ * Disable automatic evaluation of responses for $.ajax() functions (and its
+ * higher-level alternatives like $.get() and $.post()).
+ *
+ * If a response to a $.ajax() request returns a content type of "application/javascript"
+ * JQuery would previously execute the response body. This is a pretty unexpected
+ * behaviour and can result in a bypass of our Content-Security-Policy as well as
+ * multiple unexpected XSS vectors.
+ */
+ $.ajaxSetup({
+ contents: {
+ script: false
+ }
+ });
/**
* Set users locale to moment.js as soon as possible