Authorization bypass through user-controlled key in Cisco Secure Firewall Management Center (formerly Firepower Management Center, FMC) - CVE-2026-20342
Published: September 17, 2026
Vulnerability identifier: #VU150669
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20342
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to improper input validation in a specific file download API. A remote user can send a specially crafted HTTPS request and download arbitrary files from the affected system.
Affected software
Cisco Secure Firewall Management Center (formerly Firepower Management Center, FMC)
How to mitigate CVE-2026-20342
Install updates from vendor's website.
Cisco Secure Firewall Management Center (formerly Firepower Management Center, FMC) - addressed in versions 7.0.10, 7.2.12, 7.6.6, 7.7.13