Main Vulnerability Database Vulnerabilities #VU123655

Cross-site scripting in Cisco Firewall Threat Defense (FTD) and Cisco Adaptive Security Appliance (ASA) - CVE-2026-20070

Published: March 9, 2026

Vulnerability identifier: #VU123655

CSH Severity: Low

CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]

CVE-ID: CVE-2026-20070

CWE-ID: CWE-79

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in VPN Web Services. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Affected software

Cisco Firewall Threat Defense (FTD)
Cisco Adaptive Security Appliance (ASA)

How to mitigate CVE-2026-20070

Install updates from vendor's website.

Cisco Firewall Threat Defense (FTD) - addressed in versions 7.0.9, 7.2.11, 7.4.3, 7.6.4, 7.7.11
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.16.4.89, 9.18.4.71, 9.20.4.14, 9.22.2.20, 9.23.1.22, 9.24.1

External References

Related Security Bulletins