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TI-2026-71348 Aliases CVE-2026-104140

Stored cross-site scripting in QGIS Server WFS3 feature pages

Priority MEDIUM 60CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

QGIS before 3.44.12 and 4.0.0 through 4.2.3 writes feature attribute values into WFS3 HTML pages without escaping them (CWE-79). An attacker who controls values in a published writable vector layer can store script that runs in the QGIS Server origin when a user opens an items HTML page. Such script can read the viewer's session data or make authenticated requests with the viewer's privileges.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00243 15th percentileScored 2026-11-07
Fix Fixed QGIS (qgis): 3.44.12

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
qgisQGISbefore 3.44.12; 4.0.0 – 4.2.33.44.12Patch availableCNA
  • QGIS Vendorqgis Affected before 3.44.12; 4.0.0 – 4.2.3 Fixed in 3.44.12 Patch available CNA

Remediation

QGIS 3.44.12 fixes this issue. The sources list no fixed version for QGIS.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA QGIS (qgis) Fixed in 3.44.12

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-12 Threatist record created from CVE-2026-104140
  2. 2026-10-13 Affected versions changed · Red Hat
  3. 2026-10-13 CVSS score added · Red Hat
  4. 2026-10-13 CISA SSVC decision points changed

References

Other 6

  • TI-2026-19734 QGIS had validated RCE and Repository Takeover via GitHub Actions CVSS 4.0HIGH 8.7
  • TI-2025-10245 Cross-Site Scripting Vulnerability in QWC2 CVSS 4.0MEDIUM 6.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences