CVE-2026-50095
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Stored XSS in Esri ArcGIS Server

Publication date: 2026-10-26

Last updated on: 2026-10-26

Assigner: Environmental Systems Research Institute, Inc.

Description
There is a stored cross site scripting issue in Esri ArcGIS Server 11.1 and earlier on Windows and Linux that in some configurations allows a remote unauthenticated attacker to store files that contain malicious code that may execute in the context of a 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.

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Meta Information

Published
2026-10-26
Last Modified
2026-10-26
Generated
2026-10-26
AI Q&A
2026-10-26
EPSS Evaluated
N/A
NVD
CVE-2026-50095
EUVD
EUVD-2026-110061

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
Esri ArcGIS Server 11.1

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is a stored cross-site scripting (XSS) vulnerability in Esri ArcGIS Server 11.1 and earlier versions. It allows a remote unauthenticated attacker to store malicious files on the server. When a victim accesses these files through their browser, the malicious code executes in the victim's browser context.

Impact Analysis

An attacker could exploit this to steal sensitive data like session cookies or credentials, perform actions on behalf of the victim, or deliver malware. Users accessing compromised ArcGIS Server content may have their browsers compromised without needing authentication.

Mitigation Strategies

Upgrade to a patched version of ArcGIS Server (12.1, 12.0, 11.5, 11.3, or 11.1) and apply the provided patch. If using an unlisted version, upgrade to an eligible version immediately.

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