# CVE-2026-20342: Cisco Secure FMC arbitrary file download in download API

Source: https://junglewise.ai/threats/cve-2026-20342-cisco-secure-fmc-arbitrary-file-download-in-download-api  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-16. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-20342 · Severity: high · CVSS 7.7 · Published 2026-09-16

Cisco Secure Firewall Management Center (FMC) is a centralized management platform for Cisco firewall appliances. A vulnerability in its file download API allows authenticated users with the Security Analyst role to download arbitrary files from the system, potentially exposing sensitive configuration data, logs, and other confidential information stored on the management server.

Technologies: [Cisco Secure Firewall Management Center Software](https://junglewise.ai/threats/technologies/secure-firewall-management-center-software). Vendors: [Cisco](https://junglewise.ai/threats/vendors/cisco).

## Quick answers

**Is CVE-2026-20342 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20342 being exploited in the wild.

**How severe is CVE-2026-20342?** High severity, with a CVSS score of 7.7, published 16 September 2026.

**Which products and versions are affected?** Cisco Secure Firewall Management Center Software.

**Is there a fix for CVE-2026-20342?** 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-2026-20342 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-20342?** Check whether you run Cisco Secure Firewall Management Center Software. 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

CVE-2026-20342 is an arbitrary file download vulnerability in Cisco Secure FMC Software caused by insufficient input sanitization in a specific file download API endpoint. The vulnerability requires valid credentials for a user account with at least the Security Analyst (read-only) role to exploit. An attacker with such credentials can send a crafted HTTPS request to bypass path validation and download arbitrary files from the affected system. A successful exploit allows an authenticated attacker to access sensitive files they should not have permission to retrieve. Cisco has released software updates to address this vulnerability.

## Affected products

- Cisco Secure Firewall Management Center Software

## Timeline

- 2026-09-16: disclosed

## References

- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-mulivulns-4PsnFwvx](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-mulivulns-4PsnFwvx)

## Related threats

- [Cisco Secure FMC SQL injection in web management interface](https://junglewise.ai/threats/cve-2026-20344-cisco-secure-fmc-sql-injection-in-web-management-interface)
- [Cisco Secure Firewall improper adherence to coding standards](https://junglewise.ai/threats/cve-2026-20334-cisco-secure-firewall-improper-adherence-to-coding-standards)
- [Cisco Secure Firewall ASA/FTD/FMC incorrect comparison in security context](https://junglewise.ai/threats/cve-2026-20333-cisco-secure-firewall-asa-ftd-fmc-incorrect-comparison-in)
- [Cisco Secure Firewall ASA/FTD/FMC access control vulnerability](https://junglewise.ai/threats/cve-2026-20332-cisco-secure-firewall-asa-ftd-fmc-access-control-vulnerability)
- [Cisco Secure Firewall improper input validation in ASA, FTD, and FMC](https://junglewise.ai/threats/cve-2026-20330-cisco-secure-firewall-improper-input-validation-in-asa-ftd-and)