CVE-2021-35240 Stored XSS via Help Server settings

Medium 6.5 Published 31 Aug 2021 Updated 4 Aug 2024

Attackers can inject malicious scripts via Help Server settings, leading to code execution or account takeover in Internet Explorer users.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-35240?

CVE-2021-35240 is a medium-severity cross-site scripting vulnerability in SolarWinds Orion Platform, published on 31 Aug 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

A security researcher stored XSS via a Help Server setting. This affects customers using Internet Explorer, because they do not support 'rel=noopener'.

Weakness: CWE-79

Which versions are affected by CVE-2021-35240?

It affects 1 product.

Products include Solarwinds Orion Platform.

How do I fix CVE-2021-35240?

No fix has been published for CVE-2021-35240 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-2021-35240 being exploited?

There is no known exploitation of CVE-2021-35240 in the wild and no public exploit code.

Sources

Also known as GHSA-ch69-82p3-hfw4.