How severe is CVE-2026-23607?

CVE-2026-23607 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-23607 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23607?

CVE-2026-23607 affects Gfi Mailessentials. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23607?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-23607 have an EU (EUVD) identifier?

Yes. CVE-2026-23607 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7811.

When was CVE-2026-23607 published?

CVE-2026-23607 was published on 2026-02-19 and last updated on 2026-06-17.

CVE-2026-23607

CVE-2026-23607 is a medium-severity vulnerability in Gfi Mailessentials with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v4: 5.1
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7811
Weakness: CWE-79
Affected product: Gfi Mailessentials
Published: 2026-02-19
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2026-23607?: GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Anti-Spam Whitelist management interface. An authenticated user can supply HTML/JavaScript in the ctl00$ContentPlaceHolder1$pv1$txtDescription parameter to /MailEssentials/pages/MailSecurity/Whitelist.aspx, which is stored and later rendered in the management interface, allowing script execution in the context of a logged-in user.
How severe is CVE-2026-23607?: CVE-2026-23607 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-23607 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23607?: CVE-2026-23607 affects Gfi Mailessentials. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23607?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-23607 have an EU (EUVD) identifier?: Yes. CVE-2026-23607 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7811.
When was CVE-2026-23607 published?: CVE-2026-23607 was published on 2026-02-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:gfi:mailessentials:*:*:*:*:*:*:*:*

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