CVE-2021-22676

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-08-10 · updated 2026-06-17
Weakness: CWE-79

Description

UserExcelOut.asp within WebAccess/SCADA is vulnerable to cross-site scripting (XSS), which could allow an attacker to send malicious JavaScript code. This could result in hijacking of cookie/session tokens, redirection to a malicious webpage, and unintended browser action on the WebAccess/SCADA (WebAccess/SCADA versions prior to 8.4.5, WebAccess/SCADA versions prior to 9.0.1).

Affected products

Advantech Webaccess/Scada: before 8.4.5; from 9.0 before 9.0.1 — fixed in 8.4.5, 9.0.1

How to fix

Upgrade to a fixed version: Advantech Webaccess/Scada 8.4.5, 9.0.1. Check the vendor advisory for mitigations.

References

https://us-cert.cisa.gov/ics/advisories/icsa-21-217-04
https://us-cert.cisa.gov/ics/advisories/icsa-21-217-04

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