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CVE-2026-20102

MEDIUMCVSS 6.1/10EPSS 0.26%

Last modified

CVE-2026-20102 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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. EPSS estimates a 0.26% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability
0.26%

17.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAdaptive Security Appliance Software>= 9.16.1, < 9.16.4.89
CiscoAdaptive Security Appliance Software>= 9.17.1, < 9.18.4.71
CiscoAdaptive Security Appliance Software>= 9.20.1, < 9.20.4.19
CiscoAdaptive Security Appliance Software>= 9.22.1.1, < 9.22.2.32
CiscoAdaptive Security Appliance Software>= 9.23.1, < 9.23.1.26
CiscoFirepower Threat Defense Software>= 7.0.0, < 7.0.9
CiscoFirepower Threat Defense Software>= 7.1.0, < 7.2.11
CiscoFirepower Threat Defense Software>= 7.4.0, < 7.4.3
CiscoFirepower Threat Defense Software>= 7.6.0, < 10.0.0

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is 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&nbsp;to conduct a reflected XSS attack through an affected device.
How severe is CVE-2026-20102?
CVE-2026-20102 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.
How do I fix CVE-2026-20102?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-20102?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST