CVE-2019-6146Public exploitNetwork attack vector

Cross-site scripting via unvalidated Host header reflection

Published Jan 22, 2020 · Updated Aug 4, 2024

Cross-site scripting in Forcepoint Web Security 8.x allows remote attackers to run script in a user's browser via a crafted Host header. The Content Gateway block page embeds the unvalidated Host header as its displayed domain name, causing supplied markup to execute. The victim must request a policy-blocked site so the gateway returns that page, exposing browser-accessible data and actions in the page's origin.

CVSS severity5.3
Medium
EPSS probability2.98%
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 Forcepoint Web Security 8.x allows remote attackers to run script in a user's browser via a crafted Host header. The Content Gateway block page embeds the unvalidated Host header as its displayed domain name, causing supplied markup to execute. The victim must request a policy-blocked site so the gateway returns that page, exposing browser-accessible data and actions in the page's origin.

The record

CVE
CVE-2019-6146
Published
Jan 22, 2020
Updated
Aug 4, 2024
Vendor
Forcepoint
Product
Forcepoint Web Security
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 22, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=8.5, 8.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Forcepoint · Forcepoint Web Securityversion=8.5, 8.4

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
5.3ForcepointCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

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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