How severe is CVE-2026-23605?

CVE-2026-23605 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-2026-23605 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-2026-23605?

CVE-2026-23605 affects Gfi Mailessentials. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23605?

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

Does CVE-2026-23605 have an EU (EUVD) identifier?

Yes. CVE-2026-23605 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7803.

When was CVE-2026-23605 published?

CVE-2026-23605 was published on 2026-02-19 and last updated on 2026-06-17.

CVE-2026-23605

CVE-2026-23605 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-2026-7803
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 Attachment Filtering rule creation workflow. An authenticated user can supply HTML/JavaScript in the ctl00$ContentPlaceHolder1$pv1$TXB_RuleName parameter to /MailEssentials/pages/MailSecurity/attachmentchecking.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-2026-23605?: GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Attachment Filtering rule creation workflow. An authenticated user can supply HTML/JavaScript in the ctl00$ContentPlaceHolder1$pv1$TXB_RuleName parameter to /MailEssentials/pages/MailSecurity/attachmentchecking.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-2026-23605?: CVE-2026-23605 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-2026-23605 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-2026-23605?: CVE-2026-23605 affects Gfi Mailessentials. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23605?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-23605 have an EU (EUVD) identifier?: Yes. CVE-2026-23605 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7803.
When was CVE-2026-23605 published?: CVE-2026-23605 was published on 2026-02-19 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Gfi Mailessentials

CVE-2004-1312 — Critical (CVSS 10.0): A bug in the HTML parser in a certain Microsoft HTML library, as used in various third party products, may allow remote…
CVE-2025-34491 — High (CVSS 8.8): GFI MailEssentials prior to version 21.8 is vulnerable to a .NET deserialization issue. A remote and authenticated…
CVE-2025-34489 — High (CVSS 7.8): GFI MailEssentials prior to version 21.8 is vulnerable to a local privilege escalation issue. A local attacker can…
CVE-2025-34490 — Medium (CVSS 6.5): GFI MailEssentials prior to version 21.8 is vulnerable to an XML External Entity (XXE) issue. An authenticated and…
CVE-2026-23619 — Medium (CVSS 5.4): GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Local Domains…
CVE-2026-23618 — Medium (CVSS 5.4): GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Spam Keyword…

All CVEs affecting Gfi Mailessentials →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →