Medium 6.1Published Oct 12, 2026

CVE-2026-104140QGIS: Stored XSS in WFS3 getFeatures HTML page via unescaped feature attribute values

Updated under an hour ago (2026-10-19 09:50 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 13, 2026
First seen by InfoSec Signals: Oct 12, 2026

Affected products

Affected products

qgis QGIS qgis:qgis (from the name)	before 3.44.12; from 4.0.0, <= 4.2.3	CNA record

References

https://github.com/qgis/QGIS/security/advisories/GHSA-cr49-pm9v-m788x-refsource-confirm
https://github.com/qgis/QGIS/pull/66616x-refsource-misc
https://github.com/qgis/QGIS/pull/67044x-refsource-misc
https://github.com/qgis/QGIS/commit/1930e81c918818a4f5412219f8f7e470d2709f91x-refsource-misc
https://github.com/qgis/QGIS/commit/ca76fcac616dbf1c0446514fd6517296eb7c6904x-refsource-misc
https://github.com/qgis/QGIS/releases/tag/final-3_44_12x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.