Auth bypass in Cisco Secure Firewall Management Center (Fmc)
CVE-2026-20342
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).
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (47.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.000
Affected products
- Cisco Secure Firewall Management Center (Fmc) — versions 10.0.0, 10.0.1, 7.0.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20342?
- CVE-2026-20342 is a high-severity vulnerability in Cisco Secure Firewall Management Center (Fmc), classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.7/10. Published 2026-09-16.
- How severe is CVE-2026-20342?
- High severity. CVSS v3 base score is 7.7 out of 10.