CVE-2023-36555Network attack vector

Authenticated script execution via unneutralized HTML tags

Published Oct 10, 2023 · Updated Sep 18, 2024

Basic XSS in the GUI of Fortinet FortiOS 7.2.0 through 7.2.5 allows remote authenticated users to inject script-related HTML tags. The SAML and Security Fabric components fail to neutralize those tags before the GUI renders attacker-controlled content. Exploitation requires authenticated network access, high privileges, and user interaction, and runs injected script in the affected GUI context.

CVSS severity5.4
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Basic XSS in the GUI of Fortinet FortiOS 7.2.0 through 7.2.5 allows remote authenticated users to inject script-related HTML tags. The SAML and Security Fabric components fail to neutralize those tags before the GUI renders attacker-controlled content. Exploitation requires authenticated network access, high privileges, and user interaction, and runs injected script in the affected GUI context.

The record

CVE
CVE-2023-36555
Published
Oct 10, 2023
Updated
Sep 18, 2024
Vendor
Fortinet
Product
FortiOS
Classifications
CWE-80, CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.2.0 <=7.2.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Fortinet · FortiOSversion=7.2.0 <=7.2.4

Published CVSS scores

3.9Fortinet, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L
5.4NISTCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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