CVE-2026-28272Network attack vector

Browser script execution via stored configuration input

Published Feb 27, 2026 · Updated Feb 27, 2026

Stored XSS in Kiteworks Email Protection Gateway before 9.2.0 allows remote authenticated users to run scripts in other users' browsers. A configuration interface stores administrator-supplied script content without neutralizing it and renders that content in the affected user interface. Administrator privileges are required to plant the payload, and another user's interaction triggers browser-side execution that can read or alter data in that user's security context.

CVSS severity8.1
High
EPSS probability0.33%
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 Kiteworks Email Protection Gateway before 9.2.0 allows remote authenticated users to run scripts in other users' browsers. A configuration interface stores administrator-supplied script content without neutralizing it and renders that content in the affected user interface. Administrator privileges are required to plant the payload, and another user's interaction triggers browser-side execution that can read or alter data in that user's security context.

The record

CVE
CVE-2026-28272
Published
Feb 27, 2026
Updated
Feb 27, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
8.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/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
Privilegesadmin
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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