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

Medium 6.1 Published 11 Jul 2021 Updated 10 Apr 2025

A reflected XSS vulnerability in ArcGIS Server allows remote attackers to execute arbitrary JavaScript in users' browsers via crafted links.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-29103?

CVE-2021-29103 is a medium-severity cross-site scripting vulnerability in Esri Arcgis Server, published on 11 Jul 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-79

Which versions are affected by CVE-2021-29103?

It affects 1 product.

Products include Esri Arcgis Server.

How do I fix CVE-2021-29103?

No fix has been published for CVE-2021-29103 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2021-29103 being exploited?

There is no known exploitation of CVE-2021-29103 in the wild and no public exploit code.

All Esri Arcgis Server vulnerabilities

Sources

Also known as GHSA-5x8q-j8xv-5p5f.