FortiOS/Proxy XSS (CVE-2025-31366) 7.6.0-7.6.3/7.4.0-7.4.7
CVE-2025-31366 Published on October 14, 2025
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 versions, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4 all versions, FortiProxy 7.2 all versions, FortiProxy 7.0 all versions, FortiSASE 25.2.a may allow an unauthenticated attacker to perform a reflected cross site scripting (XSS) via crafted HTTP requests.
Vulnerability Analysis
CVE-2025-31366 is exploitable with network access, requires user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2025-31366 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2025-31366
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Affected Versions
Fortinet FortiProxy:- Version 7.6.0, <= 7.6.3 is affected.
- Version 7.4.0, <= 7.4.8 is affected.
- Version 7.2.0, <= 7.2.15 is affected.
- Version 7.0.0, <= 7.0.22 is affected.
- Version 25.2.a is affected.
- Version 7.6.0, <= 7.6.2 is affected.
- Version 7.4.0, <= 7.4.7 is affected.
- Version 7.2.0, <= 7.2.12 is affected.
- Version 7.0.0, <= 7.0.18 is affected.
- Version 6.4.0, <= 6.4.16 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.