XSS in Fortinet Fortios
CVE-2025-31366
An Improper Neutralization of Input During Web Page Generation vulnerability [CWE-79] vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all v…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.004 (29.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Fortinet Fortios — versions 7.6.0, 7.4.0, 7.2.0
- Fortinet Fortiproxy — versions 7.6.0, 7.4.0, 7.2.0
- Fortinet Fortisase — versions 25.3.40, 25.2.a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- psirt@fortinet.com (Vendor Advisory)
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
Frequently asked questions
- What is CVE-2025-31366?
- CVE-2025-31366 is a medium-severity vulnerability in Fortinet Fortios, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2025-10-14.
- How severe is CVE-2025-31366?
- Medium severity. CVSS v3 base score is 4.7 out of 10.
- Is CVE-2025-31366 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.