CVE-2021-26087 - CVE House

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Status published Medium CVE-2021-26087

An improper neutralization of input during web page generation in...

4.2 CVSS

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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

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Affected Vendor

Fortinet

View all reports →

Affected Software

FortiWLC

Vulnerable Versions:

8.6.0, 8.5.0, 8.4.4, 8.4.0, 8.3.3

Timeline

Official Publish: March 17th, 2025

Last Modified: March 17th, 2025

Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:F/RL:X/RC:X

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1189 Drive-by Compromise

T1059.007 JavaScript

T1539 Steal Web Session Cookie

T1213 Data from Information Repositories

T1567 Exfiltration Over Web Service

T1491.001 Defacement