XSS in Gfi Mailessentials
CVE-2026-23618
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (10.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 10.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Gfi Mailessentials
- Gfi Software Mailessentials Ai — versions 0
Weakness classification (CWE)
References
- gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resourc… (release-notes, Release Notes, patch)
- www.vulncheck.com/advisories/gfi-mailessentials-ai-anti-spam-spam-keyword-check… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-23618?
- CVE-2026-23618 is a medium-severity vulnerability in Gfi Mailessentials, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-02-19.
- How severe is CVE-2026-23618?
- Medium severity. CVSS v3 base score is 5.4 out of 10.