Vulnerability in Esri ArcGIS Server

[ Description ]Official description

There is a reflected cross site scripting vulnerability in Esri Portal for ArcGIS versions 12.1 and prior which may allow a remote, unauthenticated attacker to create a crafted link which when clicked could potentially execute arbitrary JavaScript code in the victim’s browser. A patch is provided for ArcGIS Server software in General Availability and Extended support status, which includes versions 12.1, 12.0, 11.5, 11.3, and 11.1. Other versions are in mature or retired status, which are not patch eligible. Users working with unlisted versions are advised to upgrade and apply the patch.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund14 Oct 2026WID-SEC-2026-3965

  ESRI ArcGIS: Multiple vulnerabilities Translated from German

  CVE-2026-10757CVE-2026-33520CVE-2026-33522+3 more CVEs

[ References ]References

• www.esri.com/arcgis-blog/products/trust-arcgis/administration/october-2026-arcgis-secur…