CVE-2026-23753Network attack vector

Stored XSS via unsanitized charset rendering

Published Apr 20, 2026 · Updated Apr 20, 2026

Stored cross-site scripting in GFI HelpDesk before 4.99.9 allows remote authenticated users to execute JavaScript in administrators' browsers. SWIFT_Language::Create() stores the charset POST parameter without HTML sanitization, and View_Language.RenderGrid() renders it without encoding. Administrator privileges are required to create or edit the language; the payload runs when any administrator views the Languages page.

CVSS severity4.8
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in GFI HelpDesk before 4.99.9 allows remote authenticated users to execute JavaScript in administrators' browsers. SWIFT_Language::Create() stores the charset POST parameter without HTML sanitization, and View_Language.RenderGrid() renders it without encoding. Administrator privileges are required to create or edit the language; the payload runs when any administrator views the Languages page.

The record

CVE
CVE-2026-23753
Published
Apr 20, 2026
Updated
Apr 20, 2026
Vendor
GFI Software
Product
GFI HelpDesk
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 20, 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?

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

  1. Affected versionversion=0 <4.99.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

GFI Software · GFI HelpDeskversion=0 <4.99.9

Published CVSS scores

4.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.8VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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