GFI MailEssentials AI up to 22.3 Management Interface contentchecking.aspx ctl00$ContentPlaceHolder1$pv1$TXB_RuleName cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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4.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in GFI MailEssentials AI up to 22.3. This issue affects some unknown processing of the file /MailEssentials/pages/MailSecurity/contentchecking.aspx of the component Management Interface. Performing a manipulation of the argument ctl00$ContentPlaceHolder1$pv1$TXB_RuleName results in cross site scripting. This vulnerability is reported as CVE-2026-23604. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in GFI MailEssentials AI up to 22.3. This affects an unknown functionality of the file /MailEssentials/pages/MailSecurity/contentchecking.aspx of the component Management Interface. The manipulation of the argument ctl00$ContentPlaceHolder1$pv1$TXB_RuleName with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Keyword Filtering rule creation workflow. An authenticated user can supply HTML/JavaScript in the ctl00$ContentPlaceHolder1$pv1$TXB_RuleName parameter to /MailEssentials/pages/MailSecurity/contentchecking.aspx, which is stored and later rendered in the management interface, allowing script execution in the context of a logged-in user.

The weakness was disclosed by Alex Williams. The advisory is shared at gfi.ai. This vulnerability is uniquely identified as CVE-2026-23604 since 01/14/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

By approaching the search of inurl:MailEssentials/pages/MailSecurity/contentchecking.aspx it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 22.4 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.4
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Google Hack: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: MailEssentials AI 22.4

Timelineinfo

01/14/2026 CVE reserved
02/19/2026 +36 days Advisory disclosed
02/19/2026 +0 days VulDB entry created
02/19/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: gfi.ai
Researcher: Alex Williams
Status: Confirmed

CVE: CVE-2026-23604 (🔒)
GCVE (CVE): GCVE-0-2026-23604
GCVE (VulDB): GCVE-100-346977

Entryinfo

Created: 02/19/2026 21:50
Changes: 02/19/2026 21:50 (79), 02/19/2026 21:51 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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