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CVE-2025-31366

An Improper Neutralization of Input During Web Page Generation vulnerability [CWE-79] vulnerability in Fortinet FortiOS 7.6.0 through…

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.

Timeline

  1. ID reserved

    By fortinet

  2. · 7 months later

    Published

  3. · 12 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-31366, by who scored it
Scored byCVSSScoreVector
fortinetCNA (assigner)3.1Medium4.5CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C
NVDNVD · Modified3.1Medium6.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS (exploitation in 30 days)
0.40% · top 65% of all CVEs (12 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.5.

Affected products

  • Fortinet · FortiSASE

    • affected 25.2.a

  • Fortinet · FortiOS

    • affected 7.6.0 – ≤ 7.6.2
    • affected 7.4.0 – ≤ 7.4.7
    • affected 7.2.0 – ≤ 7.2.13
    • affected 7.0.0 – ≤ 7.0.19
    • affected 6.4.0 – ≤ 6.4.16

  • Fortinet · FortiProxy

    • affected 7.6.0 – ≤ 7.6.3
    • affected 7.4.0 – ≤ 7.4.8
    • affected 7.2.0 – ≤ 7.2.16
    • affected 7.0.0 – ≤ 7.0.23

What to do

Solution: Upgrade to FortiOS version 7.6.4 or above Upgrade to FortiOS version 7.4.9 or above Fortinet remediated this issue in FortiSASE version 25.3.b and hence customers do not need to perform any action. Upgrade to FortiProxy version 7.6.4 or above

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .