Medium severity · published Feb 19, 2026
CVE-2026-23618
GFI MailEssentials AI < 22.4 Anti-Spam Spam Keyword Checking Subject Condition Stored XSS
5.4
CVSS
0.2%
EPSS
No
On KEV
Description
GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Spam Keyword Checking (Subject) conditions interface. An authenticated user can supply HTML/JavaScript in the ctl00$ContentPlaceHolder1$pvSubject$TXB_SubjectCondition parameter to /MailEssentials/pages/MailSecurity/ASKeywordChecking.aspx, which is stored and later rendered in the management interface, allowing script execution in the context of a logged-in user.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
MailEssentials AI · GFI Software
before 22.4 · source: vendor
MA
Mailessentials · Gfi
before 22.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-23618
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-23618
Release Notes
https://gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resources/documentation/product-releases
Third Party Advisory
https://www.vulncheck.com/advisories/gfi-mailessentials-ai-anti-spam-spam-keyword-checking-subject-condition-stored-xss
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