CVE-2021-29103: There is a reflected Cross Site Scripting (XSS) vulnerability in Esri ArcGIS Server version 10.8.1 and below.

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-07-11 · updated 2026-06-17
Weakness: CWE-79

Description

A reflected Cross Site Scripting (XXS) vulnerability in ArcGIS Server version 10.8.1 and below may allow a remote attacker able to convince a user to click on a crafted link which could potentially execute arbitrary JavaScript code in the user’s browser.

Affected products

Esri ArcGIS Server: before 10.9.0 — fixed in 10.9.0

How to fix

Upgrade to a fixed version: Esri ArcGIS Server 10.9.0. Check the vendor advisory for mitigations.

References

https://www.esri.com/arcgis-blog/products/arcgis-enterprise/administration/arcgis-server-security-2021-update-1-patch/
https://www.esri.com/arcgis-blog/products/arcgis-enterprise/administration/arcgis-server-security-2021-update-1-patch/

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