CVE-2020-6646Network attack vector

Stored XSS via unsanitized disclaimer description

Published Mar 17, 2020 · Updated Oct 25, 2024

Stored XSS in the FortiWeb GUI in 6.2.2 and earlier and 6.3.0 allows remote authenticated users to execute script via a disclaimer description. The GUI stores the Disclaimer Description without neutralizing attacker-supplied markup, so the replacement message renders it as active browser content. Administrative access and subsequent viewing of the stored disclaimer are required; execution is confined to the viewer's browser context.

CVSS severity5.4
Medium
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the FortiWeb GUI in 6.2.2 and earlier and 6.3.0 allows remote authenticated users to execute script via a disclaimer description. The GUI stores the Disclaimer Description without neutralizing attacker-supplied markup, so the replacement message renders it as active browser content. Administrative access and subsequent viewing of the stored disclaimer are required; execution is confined to the viewer's browser context.

The record

CVE
CVE-2020-6646
Published
Mar 17, 2020
Updated
Oct 25, 2024
Vendor
Fortinet
Product
FortiWeb
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 17, 2020CVE 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=FortiWeb 6.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Fortinet · FortiWebversion=FortiWeb 6.2.2

Published CVSS scores

5.4NIST NVDCVSS: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

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.

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Technologies

Your stack

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Your stack

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