# CVE-2026-23607: GFI MailEssentials AI < 22.4 Anti-Spam Whitelist Description Stored XSS

> An authenticated user can inject malicious scripts into the Anti-Spam Whitelist description, leading to script execution in the context of other logged-in administrators.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 19 Feb 2026
- **Updated:** 14 May 2026
- **Also known as:** GHSA-6ccf-h672-3wqh

## What is CVE-2026-23607?

CVE-2026-23607 is a medium-severity cross-site scripting vulnerability in GFI Software MailEssentials AI, published on 19 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-23607?

It affects 1 product.


Products: Gfi Mailessentials.

## How do I fix CVE-2026-23607?

No fix has been published for CVE-2026-23607 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-23607 being exploited?

There is no known exploitation of CVE-2026-23607 in the wild and no public exploit code.

## Other vulnerabilities in GFI Software MailEssentials AI

- [CVE-2004-1312](https://insights.sbomify.com/CVE-2004-1312/): Denial of service in n/a (critical 10.0)
- [CVE-2025-34491](https://insights.sbomify.com/CVE-2025-34491/): GFI MailEssentials < 21.8 MultiNode Insecure Deserialization (high 8.8)
- [CVE-2025-34489](https://insights.sbomify.com/CVE-2025-34489/): GFI MailEssentials < 21.8 Local Privilege Escalation (high 7.8)
- [CVE-2025-34490](https://insights.sbomify.com/CVE-2025-34490/): GFI MailEssentials < 21.8 XXE Arbitrary File Read (medium 6.5)
- [CVE-2026-23620](https://insights.sbomify.com/CVE-2026-23620/): GFI MailEssentials AI < 22.4 ListServer.IsDBExist() Absolute Directory Traversal to File Enumeration (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-23607 and fix it if it is affected.

What it is: CVE-2026-23607 is a medium-severity cross-site scripting vulnerability in GFI Software MailEssentials AI, published on 19 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-23607 in the wild and no public exploit code.

Affected product: GFI Software MailEssentials AI. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-23607/ (Markdown: https://insights.sbomify.com/CVE-2026-23607/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-23607
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-23607
- OSV: https://osv.dev/vulnerability/CVE-2026-23607

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-23607/
Summaries are generated and may contain mistakes; the official description above is the record.