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Vulnerability record · CVE-2021-22676 · published 10 August 2021

CVE-2021-22676: Advantech webaccess\/scada cross-site scripting vulnerability

Advantech · Webaccess\/Scada

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).

6.1 CVSS 3.1 Medium EPSS 0.64% · top 51.0% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
0.64%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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).

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://us-cert.cisa.gov/ics/advisories/icsa-21-217-04 Third Party AdvisoryUS Government Resource
https://us-cert.cisa.gov/ics/advisories/icsa-21-217-04 Third Party AdvisoryUS Government Resource

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-1437Advantech webaccess\/scada memory buffer overflow vulnerabilityAll versions prior to 9.1.4 of Advantech WebAccess/SCADA are vulnerable to use of untrusted pointers. The RPC arguments the client sent could contain…EPSS 2.8%9.8CVE-2023-32628Advantech webaccess\/scada unrestricted file upload vulnerabilityIn Advantech WebAccss/SCADA v9.1.3 and prior, there is an arbitrary file upload vulnerability that could allow an attacker to modify the file extensi…EPSS 0.71%9.8CVE-2023-32540Advantech webaccess\/scada code injection vulnerabilityIn Advantech WebAccss/SCADA v9.1.3 and prior, there is an arbitrary file overwrite vulnerability, which could allow an attacker to overwrite any file…EPSS 0.90%9.8CVE-2021-32943Advantech webaccess\/scada stack-based buffer overflow vulnerabilityThe affected product is vulnerable to a stack-based buffer overflow, which may allow an attacker to remotely execute arbitrary code on the WebAccess/…EPSS 1.9%9.8CVE-2019-6523Advantech webaccess\/scada sql injection vulnerabilityWebAccess/SCADA, Version 8.3. The software does not properly sanitize its inputs for SQL commands.EPSS 2.0%9.8CVE-2019-6519Advantech webaccess\/scada improper authentication vulnerabilityWebAccess/SCADA, Version 8.3. An improper authentication vulnerability exists that could allow a possible authentication bypass allowing an attacker …EPSS 2.8%8.8CVE-2021-22669Advantech webaccess\/scada incorrect permission assignment vulnerabilityIncorrect permissions are set to default on the ‘Project Management’ page of WebAccess/SCADA portal of WebAccess/SCADA Versions 9.0.1 and prior, whic…EPSS 1.2%8.8CVE-2020-25161Advantech webaccess\/scada vulnerabilityThe WADashboard component of WebAccess/SCADA Versions 9.0 and prior may allow an attacker to control or influence a path used in an operation on the …EPSS 1.6%

Source: NIST National Vulnerability Database (record CVE-2021-22676), CISA KEV, FIRST EPSS (scores of 2026-10-03). This page is refreshed as NVD updates the record.