Fix handling link href attribute value with (valid) newline characters (#1488940)

1 files changed, 2 insertions, 1 deletions

diff --git a/program/lib/Roundcube/rcube_washtml.php b/program/lib/Roundcube/rcube_washtml.php
index 715c46047..2a261419f 100644
--- a/program/lib/Roundcube/rcube_washtml.php
+++ b/program/lib/Roundcube/rcube_washtml.php
@@ -240,7 +240,8 @@ class rcube_washtml
             $value = $node->getAttribute($key);
 
             if (isset($this->_html_attribs[$key]) ||
-                ($key == 'href' && !preg_match('!^(javascript|vbscript|data:text)!i', $value)
+                ($key == 'href' && ($value = trim($value))
+                    && !preg_match('!^(javascript|vbscript|data:text)!i', $value)
                     && preg_match('!^([a-z][a-z0-9.+-]+:|//|#).+!i', $value))
             ) {
                 $t .= ' ' . $key . '="' . htmlspecialchars($value, ENT_QUOTES) . '"';