Simple Image Gallery (Freed) by Joomlaworks, version 3.5.0 and previous, XSS
Resolution: update to 3.6.0
Update notice: https://www.joomlaworks.net/blog/item/269-simple-image-gallery-free-v3-6-0-released-featuring-enhanced-print-previews-fixing-xss-vulnerability-related-to-print-page-output
Note that the developer did not inform the VEL #tellvel
.