CVE-2026-23612Network attack vector

Stored XSS via unescaped DNS blocklist entry

Published Feb 19, 2026 · Updated Feb 19, 2026

Stored XSS in GFI MailEssentials AI before 22.4 allows remote authenticated users to execute scripts in a logged-in user's browser. The IP DNS Blocklist page stores HTML or JavaScript from the ctl00$ContentPlaceHolder1$pv1$TXB_IPs parameter and renders it without neutralization in the management interface. Exploitation requires authenticated access to change the blocklist and a logged-in user to view the poisoned configuration; impact is limited to that user's web session.

CVSS severity5.1
Medium
EPSS probability0.17%
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 GFI MailEssentials AI before 22.4 allows remote authenticated users to execute scripts in a logged-in user's browser. The IP DNS Blocklist page stores HTML or JavaScript from the ctl00$ContentPlaceHolder1$pv1$TXB_IPs parameter and renders it without neutralization in the management interface. Exploitation requires authenticated access to change the blocklist and a logged-in user to view the poisoned configuration; impact is limited to that user's web session.

The record

CVE
CVE-2026-23612
Published
Feb 19, 2026
Updated
Feb 19, 2026
Vendor
GFI Software
Product
GFI MailEssentials
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 19, 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 <22.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GFI Software · GFI MailEssentialsversion=0 <22.4

Published CVSS scores

5.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1189Drive-by Compromise

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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