CVE-2026-20342 Cisco Secure Firewall Management Center Software Low Privileged Arbitrary File Download Vulnerability
Authenticated attackers can download arbitrary files from Cisco Secure Firewall Management Center due to unsanitized input in a file download API.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20342?
CVE-2026-20342 is a high-severity path traversal vulnerability in Cisco Secure Firewall Management Center (FMC), published on 16 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability in a specific file download API of Cisco Secure FMC Software could allow an authenticated, remote attacker to download arbitrary files from an affected system. This vulnerability exists because user input is not being sanitized. An attacker could exploit this vulnerability by sending a crafted HTTPS request. A successful exploit could allow the attacker to download arbitrary files from the affected system. To exploit this vulnerability, the attacker must have valid credentials for a user account with at least the role of Security Analyst (read-only).
Weakness: CWE-639
Which versions are affected by CVE-2026-20342?
How do I fix CVE-2026-20342?
No fix has been published for CVE-2026-20342 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-20342 being exploited?
There is no known exploitation of CVE-2026-20342 in the wild and no public exploit code.
Sources
Also known as GHSA-2784-9wmv-5cq2.