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-rw-r--r--includes/common.inc3
1 files changed, 3 insertions, 0 deletions
diff --git a/includes/common.inc b/includes/common.inc
index 4b47f92cb..b003314fa 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -127,6 +127,9 @@ function drupal_clear_path_cache() {
/**
* Set an HTTP response header for the current page.
+ *
+ * Note: when sending a Content-Type header, always include a 'charset' type
+ * too. This is necessary to avoid security bugs (e.g. UTF-7 XSS).
*/
function drupal_set_header($header = NULL) {
// We use an array to guarantee there are no leading or trailing delimiters.