What is the severity of CVE-2021-26087?

CVE-2021-26087 has been assigned a severity rating of high due to potential exploitation by both authenticated and unauthenticated attackers.

How do I fix CVE-2021-26087?

To fix CVE-2021-26087, upgrade to FortiWLC version 8.6.0 or later, which addresses this vulnerability.

What types of attacks can CVE-2021-26087 facilitate?

CVE-2021-26087 allows attackers to inject malicious content through improper input validation in the FortiWLC web interface.

Which versions of FortiWLC are affected by CVE-2021-26087?

CVE-2021-26087 affects FortiWLC versions 8.5.3 and below, 8.4.8 and below, and 8.3.3.

Who can exploit CVE-2021-26087?

Both authenticated remote attackers and non-authenticated attackers on the same network can exploit CVE-2021-26087.

Vulnerability/
CVE-2021-26087

medium

4.3

CWE

17/3/2025

CVE-2021-26087: XSS

First published: Mon Mar 17 2025(Updated: )

An improper neutralization of input during web page generation in FortiWLC version 8.6.0, version 8.5.3 and below, version 8.4.8 and below, version 8.3.3 web interface may allow both authenticated remote attackers and non-authenticated attackers in the same network as the appliance to perform a stored cross site scripting attack (XSS) via injecting malicious payloads in different locations.

Credit: psirt@fortinet.com

Affected Software	Affected Version	How to fix
Fortinet FortiWLC	<8.5.3<8.4.8<8.3.3

Remedy

Please upgrade to FortiWLC version 8.6.1 or above. Please upgrade to FortiWLC version 8.5.4 or above.

Never miss a vulnerability like this again

Reference Links

https://fortiguard.fortinet.com/psirt/FG-IR-20-137

Frequently Asked Questions

What is the severity of CVE-2021-26087?
CVE-2021-26087 has been assigned a severity rating of high due to potential exploitation by both authenticated and unauthenticated attackers.
How do I fix CVE-2021-26087?
To fix CVE-2021-26087, upgrade to FortiWLC version 8.6.0 or later, which addresses this vulnerability.
What types of attacks can CVE-2021-26087 facilitate?
CVE-2021-26087 allows attackers to inject malicious content through improper input validation in the FortiWLC web interface.
Which versions of FortiWLC are affected by CVE-2021-26087?
CVE-2021-26087 affects FortiWLC versions 8.5.3 and below, 8.4.8 and below, and 8.3.3.
Who can exploit CVE-2021-26087?
Both authenticated remote attackers and non-authenticated attackers on the same network can exploit CVE-2021-26087.

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