CVE-2026-33520
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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 impacted ArcGIS Server software in General Availability and Extended support status, which includes versions 11.5. 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-2026-33520
EUVD
EUVD-2026-110058

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. When a victim clicks this link, arbitrary JavaScript code may execute in their browser.

Impact Analysis

An attacker could trick users into clicking a malicious link, leading to unauthorized script execution in their browser. This may result in session hijacking, data theft, or defacement of web pages. The impact depends on user privileges and the sensitivity of accessed data.

Compliance Impact

This vulnerability could lead to unauthorized access or disclosure of personal or sensitive data, violating GDPR or HIPAA requirements. Organizations must address it to maintain compliance with data protection regulations.

Mitigation Strategies

Upgrade to ArcGIS Server version 11.5 or apply the provided patch if using versions in General Availability or Extended support. For versions in mature or retired status, upgrade to a supported version immediately.

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