CVE-2026-104140
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.
Does this matter?
Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 0.24% probability · 15th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Source
- security-advisories@github.com
EPSS moved from 0.2% on 13 October 2026 to 0.2% on 26 October 2026.
References
- https://github.com/qgis/QGIS/commit/1930e81c918818a4f5412219f8f7e470d2709f91
- https://github.com/qgis/QGIS/commit/ca76fcac616dbf1c0446514fd6517296eb7c6904
- https://github.com/qgis/QGIS/pull/66616
- https://github.com/qgis/QGIS/pull/67044
- https://github.com/qgis/QGIS/releases/tag/final-3_44_12
- https://github.com/qgis/QGIS/security/advisories/GHSA-cr49-pm9v-m788
- https://github.com/qgis/QGIS/security/advisories/GHSA-cr49-pm9v-m788
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.