Description
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 if_nullptr_null_str 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.
References7
- github.com/qgis/QGIS/commit/1930e81c918818a4f5412219f8f7e470d27…
- github.com/qgis/QGIS/commit/ca76fcac616dbf1c0446514fd6517296eb7…
- github.com/qgis/QGIS/pull/66616
- github.com/qgis/QGIS/pull/67044
- github.com/qgis/QGIS/releases/tag/final-3_44_12
- github.com/qgis/QGIS/security/advisories/GHSA-cr49-pm9v-m788
- github.com/qgis/QGIS/security/advisories/GHSA-cr49-pm9v-m788
Metrics
- CVSS 3.1
-
6.1
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 16 · as of 11 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.