An issue was discovered in the Mentor dashboard in the GrowthExperiments extension where certain MediaWiki messages were not properly sanitized. This allowed for the injection and execution of HTML and JavaScript, specifically affecting the growthexperiments-mentor-dashboard-mentee-overview-add-filter-total-edits-headline, growthexperiments-mentor-dashboard-mentee-overview-add-filter-starred-headline, growthexperiments-mentor-dashboard-mentee-overview-info-text, growthexperiments-mentor-dashboard-mentee-overview-info-legend-headline, and growthexperiments-mentor-dashboard-mentee-overview-active-ago messages.