# CVE-2026-20102: Cisco Secure Firewall ASA SAML reflected XSS

Source: https://junglewise.ai/threats/cve-2026-20102-cisco-secure-firewall-asa-saml-reflected-xss  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-04. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-20102 · Severity: medium · CVSS 6.1 · Published 2026-03-04

Cisco Secure Firewall ASA and Threat Defense (FTD) devices that support SAML 2.0 single sign-on (SSO) for remote access VPN are vulnerable to reflected cross-site scripting (XSS) attacks. An attacker can craft a malicious link that, when clicked by a user, injects malicious code into the browser and steals sensitive information or hijack the user's session. This affects firewall administrators and remote workers who authenticate through the SAML SSO feature.

Technologies: [Cisco Secure Firewall ASA Software](https://junglewise.ai/threats/technologies/secure-firewall-asa-software), [Cisco Secure Firewall Threat Defense Software](https://junglewise.ai/threats/technologies/firepower-threat-defense-software). Vendors: [Cisco](https://junglewise.ai/threats/vendors/cisco).

## Quick answers

**Is CVE-2026-20102 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20102 being exploited in the wild.

**How severe is CVE-2026-20102?** Medium severity, with a CVSS score of 6.1, published 4 March 2026.

**Which products and versions are affected?** Cisco Secure Firewall ASA Software Multiple releases (see Cisco advisory for complete version matrix); Cisco Secure Firewall Threat Defense Software Multiple releases (see Cisco advisory for complete version matrix).

**Is there a fix for CVE-2026-20102?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-20102 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-20102?** Check whether you run Cisco Secure Firewall ASA Software or Cisco Secure Firewall Threat Defense Software at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This vulnerability is a reflected XSS (CWE-79) in the SAML 2.0 SSO feature, caused by insufficient input validation of HTTP parameters. The attack requires an unauthenticated attacker to persuade a user (typically an administrator or remote VPN user) to click a malicious link pointing to the affected device. The vulnerability has a network attack vector and requires user interaction (social engineering) to succeed. A successful exploit allows the attacker to conduct a reflected XSS attack through the SAML SSO endpoint, potentially accessing sensitive browser-based information or session tokens. Cisco has released software updates to address this issue; no workarounds are available.

## Affected products

- Cisco Secure Firewall ASA Software Multiple releases (see Cisco advisory for complete version matrix)
- Cisco Secure Firewall Threat Defense Software Multiple releases (see Cisco advisory for complete version matrix)

## Timeline

- 2026-03-04: disclosed: Cisco published security advisory

## References

- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-saml-LktTrwZP](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-saml-LktTrwZP)

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