Cisco Secure Firewall ASA/FTD XSS via Unvalidated SAML 2.0 SSO
CVE-2026-20102 Published on March 4, 2026

Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software SAML Reflected Cross-Site Scripting Vulnerability
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.

NVD

Vulnerability Analysis

CVE-2026-20102 is exploitable with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.

Attack Vector:

NETWORK

Attack Complexity:

LOW

Privileges Required:

NONE

User Interaction:

REQUIRED

Scope:

CHANGED

Confidentiality Impact:

LOW

Integrity Impact:

LOW

Availability Impact:

NONE

Weakness Type

What is a XSS Vulnerability?

The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

CVE-2026-20102 has been classified to as a XSS vulnerability or weakness.

Products Associated with CVE-2026-20102

Want to know whenever a new CVE is published for Cisco Adaptive Security Appliance? stack.watch will email you.

Cisco Adaptive Security Appliance

Affected Versions

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software:

Version 9.16.1 is affected.
Version 9.16.1.28 is affected.
Version 9.16.2 is affected.
Version 9.16.2.3 is affected.
Version 9.16.2.7 is affected.
Version 9.17.1 is affected.
Version 9.16.2.11 is affected.
Version 9.16.2.13 is affected.
Version 9.16.2.14 is affected.
Version 9.17.1.7 is affected.
Version 9.17.1.9 is affected.
Version 9.17.1.10 is affected.
Version 9.17.1.11 is affected.
Version 9.17.1.13 is affected.
Version 9.17.1.15 is affected.
Version 9.17.1.20 is affected.
Version 9.17.1.30 is affected.
Version 9.17.1.33 is affected.
Version 9.17.1.39 is affected.
Version 9.17.1.45 is affected.
Version 9.17.1.46 is affected.
Version 9.23.1.13 is affected.
Version 9.20.4.7 is affected.
Version 9.22.2.13 is affected.
Version 9.18.4.66 is affected.
Version 9.20.4.10 is affected.
Version 9.23.1.19 is affected.
Version 9.18.4.67 is affected.

Cisco Secure Firewall Threat Defense (FTD) Software:

Version 7.0.0 is affected.
Version 7.0.0.1 is affected.
Version 7.0.1 is affected.
Version 7.1.0 is affected.
Version 7.0.1.1 is affected.
Version 7.1.0.1 is affected.
Version 7.1.0.2 is affected.
Version 7.1.0.3 is affected.

Exploit Probability

EPSS

0.02%

Percentile

5.17%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.