CVE-2021-42752Network attack vector

Authenticated browser script execution via crafted requests

Published Dec 8, 2021 · Updated Oct 25, 2024

Cross-site scripting in Fortinet FortiWLM 8.6.1 and earlier allows remote authenticated users to execute JavaScript via crafted HTTP requests. Fortinet has not published the affected handler or the input that is inserted into generated web content without sufficient neutralization. Exploitation requires low-privileged access and victim interaction, allowing limited access to or modification of browser-visible data.

CVSS severity5.4
Medium
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Fortinet FortiWLM 8.6.1 and earlier allows remote authenticated users to execute JavaScript via crafted HTTP requests. Fortinet has not published the affected handler or the input that is inserted into generated web content without sufficient neutralization. Exploitation requires low-privileged access and victim interaction, allowing limited access to or modification of browser-visible data.

The record

CVE
CVE-2021-42752
Published
Dec 8, 2021
Updated
Oct 25, 2024
Vendor
Fortinet
Product
FortiWLM
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 25, 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=FortiWLM 8.6.1, 8.6.0, 8.5.2, 8.5.1, 8.5.0, 8.4.2, 8.4.1, 8.4.0, 8.3.2, 8.3.1, 8.3.0, 8.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Fortinet · FortiWLMversion=FortiWLM 8.6.1, 8.6.0, 8.5.2, 8.5.1, 8.5.0, 8.4.2, 8.4.1, 8.4.0, 8.3.2, 8.3.1, 8.3.0, 8.2.2

Published CVSS scores

5.4Fortinet, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NIST NVDCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/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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