6.1

CVE-2025-31366: fortinet fortios Cross-site Scripting

CVSS: 6.1v3.1MediumModified
Published 14-10-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-31366 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in fortinet fortios. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 32.9% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (NVD)
EPSS score
0.40%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-10-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

33%

Versus all other CVEs

30-day change

0.00 pp

From 0.40% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.40%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Fortinet3 products
  • fortios≥ 7.6.0, ≤ 7.6.2 | ≥ 7.4.0, ≤ 7.4.7 | ≥ 7.2.0, ≤ 7.2.13 | ≥ 7.0.0, ≤ 7.0.19 | ≥ 6.4.0, ≤ 6.4.16 | ≥ 6.4.0, < 7.4.9 | ≥ 7.6.0, < 7.6.4
  • fortiproxy≥ 7.6.0, ≤ 7.6.3 | ≥ 7.4.0, ≤ 7.4.8 | ≥ 7.2.0, ≤ 7.2.16 | ≥ 7.0.0, ≤ 7.0.23 | ≥ 7.0.0, < 7.6.4
  • fortisase25.2.a | 25.3.40

1 vendor · 3 products

References

2 links