CVE-2026-50096
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Reflected XSS in Esri Portal for ArcGIS

Publication date: 2026-10-26

Last updated on: 2026-10-26

Assigner: Environmental Systems Research Institute, Inc.

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.

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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-2026-50096
EUVD
EUVD-2026-110062

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 reflected cross-site scripting (XSS) vulnerability in Esri Portal for ArcGIS versions 12.1 and earlier. It allows a remote, unauthenticated attacker to craft a malicious link that, when clicked by a victim, could execute arbitrary JavaScript code in the victim's browser.

Detection Guidance

This vulnerability is specific to Esri Portal for ArcGIS versions 12.1 and prior. To detect it, check the installed version of ArcGIS Server software by running commands like 'arcgis-server --version' or checking the software's about section. Inspect network traffic for suspicious URLs or scripts, especially those containing JavaScript payloads.

Impact Analysis

An attacker could trick you into clicking a malicious link, potentially stealing session cookies, redirecting you to phishing sites, or performing actions on your behalf without your knowledge. This could lead to unauthorized access to your data or account.

Mitigation Strategies

Immediately upgrade to a patched version of ArcGIS Server (12.1, 12.0, 11.5, 11.3, or 11.1) if using General Availability or Extended support status. If using mature or retired versions, upgrade to a supported version. Apply the provided patch from Esri. Avoid clicking untrusted links and monitor for unusual activity.

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