CVE-2026-20102 Cisco CVE debrief

Who should care

Administrators and users of Cisco Secure Firewall ASA Software and Cisco Secure Firewall Threat Defense (FTD) Software should be aware of this vulnerability and take necessary precautions to mitigate it. Operators, platform administrators, vulnerability management teams, and security teams should review the vulnerability details and assess their exposure. They should also plan for vendor-supported updates or mitigations and implement compensating controls if necessary.

Technical summary

The vulnerability is due to insufficient input validation of multiple HTTP parameters in the SAML 2.0 SSO feature of Cisco Secure Firewall ASA Software and Cisco Secure Firewall Threat Defense (FTD) Software. An attacker could exploit this vulnerability by persuading a user to access a malicious link, allowing the attacker to conduct a reflected XSS attack through an affected device. The vulnerability has a CVSS score of 6.1 and is classified as MEDIUM severity.

Defensive priority

Medium-priority defensive actions are required to address this vulnerability.

Recommended defensive actions

• Apply patches or updates provided by Cisco to address the vulnerability
• Implement additional security measures, such as input validation and sanitization
• Monitor systems for suspicious activity
• Restrict access to sensitive information
• Conduct regular security audits and vulnerability assessments

Evidence notes

The CVE record and NVD detail provide information on the vulnerability, including its description, CVSS score, and affected products. A vendor advisory is available for mitigation. Cisco Secure Firewall ASA Software and Cisco Secure Firewall Threat Defense (FTD) Software are affected. The SAML 2.0 SSO feature is impacted. The vulnerability allows for reflected XSS attacks. Defenders should verify affected product deployments, review official advisories, and plan for vendor-supported updates or mitigations.

Official resources