XSS in Cisco Adaptive Security Appliance Software
CVE-2026-20102
A vulnerability in the SAML 2.0 single sign-on (SSO) feature of Cisco Secure Firewall ASA Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against the SAML feature and access sensitive, browser-based information. This vulnerability is due to insufficient input validation of multiple HTTP parameters. An attacker could exploit this vulnerability by persuading a user to access a malicious link. A successful exploit could allow the attacker to conduct a reflected XSS attack through an affected device.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.003 (18.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Cisco Adaptive_security_appliance_software
- Cisco Secure Firewall Adaptive Security Appliance (Asa) Software — versions 9.16.1, 9.16.1.28, 9.16.2
- Cisco Secure Firewall Threat Defense (Ftd) Software — versions 7.0.0, 7.0.0.1, 7.0.1
- Cisco Firepower_threat_defense_software
- Cisco Secure_firewall_threat_defense
Weakness classification (CWE)
References
- psirt@cisco.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-20102?
- CVE-2026-20102 is a medium-severity vulnerability in Cisco Adaptive Security Appliance Software, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-03-04.
- How severe is CVE-2026-20102?
- Medium severity. CVSS v3 base score is 6.1 out of 10.