CVE-2026-20102: Cisco Adaptive Security Appliance Software

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Cisco Adaptive Security Appliance Software: from 9.16.1, before 9.16.4.89 (fixed in 9.16.4.89); from 9.17.1, before 9.18.4.71 (fixed in 9.18.4.71); from 9.20.1, before 9.20.4.19 (fixed in 9.20.4.19); from 9.22.1.1, before 9.22.2.32 (fixed in 9.22.2.32); from 9.23.1, before 9.23.1.26 (fixed in 9.23.1.26)
• Cisco Secure Firewall Threat Defense: from 7.0.0, before 7.0.9 (fixed in 7.0.9); from 7.1.0, before 7.2.11 (fixed in 7.2.11); from 7.4.0, before 7.4.3 (fixed in 7.4.3); from 7.6.0, before 10.0.0 (fixed in 10.0.0)

Published 2026-03-04. Last modified 2026-08-11.