# CVE-2026-23620: GFI MailEssentials AI < 22.4 ListServer.IsDBExist() Absolute Directory Traversal to File Enumeration

> An authenticated attacker can enumerate arbitrary files on the server via path traversal in the IsDBExist method, exposing sensitive file existence information.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Feb 2026
- **Updated:** 26 May 2026
- **Also known as:** GHSA-vp99-6r6x-6v3c

## What is CVE-2026-23620?

CVE-2026-23620 is a medium-severity path traversal vulnerability in GFI Software MailEssentials AI, published on 19 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

GFI MailEssentials AI versions prior to 22.4 contain an arbitrary file existence enumeration vulnerability in the ListServer.IsDBExist() web method exposed at /MailEssentials/pages/MailSecurity/ListServer.aspx/IsDBExist. An authenticated user can supply an unrestricted filesystem path via the JSON key \"path\", which is URL-decoded and passed to File.Exists(), allowing the attacker to determine whether arbitrary files exist on the server.

Weakness: CWE-203 (Observable Discrepancy)

## Which versions are affected by CVE-2026-23620?

It affects 1 product.


Products: Gfi Mailessentials.

## How do I fix CVE-2026-23620?

No fix has been published for CVE-2026-23620 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-23620 being exploited?

There is no known exploitation of CVE-2026-23620 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-2026-23621](https://insights.sbomify.com/CVE-2026-23621/): GFI MailEssentials AI < 22.4 ListServer.IsPathExist() Absolute Directory Traversal to File Enumeration (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-23620 and fix it if it is affected.

What it is: CVE-2026-23620 is a medium-severity path traversal vulnerability in GFI Software MailEssentials AI, published on 19 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-23620 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-2026-23620/ (Markdown: https://insights.sbomify.com/CVE-2026-23620/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-23620
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-23620
- OSV: https://osv.dev/vulnerability/CVE-2026-23620

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-23620/
Summaries are generated and may contain mistakes; the official description above is the record.