5.4

CVE-2026-23618: gfi software mailessentials ai Cross-site Scripting

CVSS: 5.4v3.1MediumAnalyzed
Published 19-02-2026Last modified 14-05-2026
Open JSON

Vulnerability summary

CVE-2026-23618 is a medium (CVSS 5.4) Cross-site Scripting vulnerability in gfi software mailessentials ai. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.21%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 19-02-2026
    PublishedVulnerability first disclosed.
  2. 14-05-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

10%

Versus all other CVEs

30-day change

+0.03 pp

From 0.18% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.21%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Gfi1 product
Gfi software1 product

2 vendors · 2 products

References

2 links