Cross-Site Scripting vulnerability in attribute table in QGIS QWC2 < 2025.08.14 allows an authorized attacker to plant arbitrary JavaScript code in the page.

Cross-site scripting vulnerability in QGIS QWC2 Registration GUI <=v2025.03.31 allows an authorized attacker to plant arbitrary JavaScript code in the page

QGIS is a free, open source, cross-platform geographic information system. Prior to 3.44.12 and 4.0.0 through 4.2.3, QGIS Server renders feature data in WFS3 (OGC API Features) HTML responses without HTML escaping. Attacker-controlled feature.properties values from a published writable vector layer reach resources/server/api/ogc/templates/wfs3/getFeatures.html through QgsServerOgcApiHandler::htmlDump and the ifnullptrnullstr callback. A user who opens an items HTML page can execute stored markup or script in the QGIS Server origin, which can expose the viewer's session data or issue authenticated requests with the viewer's privileges. This issue is fixed in version 3.44.12.