# CVE-2026-44400: MailEnable Enterprise Premium < 10.55 Authorization Bypass via WebAdmin

> Attackers can bypass authentication in MailEnable WebAdmin by replaying low-privilege tokens to perform administrative actions.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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:** 8 May 2026
- **Updated:** 14 Jul 2026
- **Also known as:** GHSA-f3v7-jqh4-whf5

## What is CVE-2026-44400?

CVE-2026-44400 is a high-severity authentication bypass vulnerability in Mailenable Mailenable, published on 8 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

MailEnable Enterprise Premium 10.55 and earlier contains an improper authorization vulnerability in the WebAdmin mobile portal that allows attackers to bypass authentication checks by reusing AuthenticationToken cookies generated for low-privileged users. Attackers can obtain a token from the WebMail login endpoint using the PersistentLogin parameter and replay it against the WebAdmin portal to perform highly privileged administrative actions.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-44400?

It affects 1 product.


Products: Mailenable Mailenable.

## How do I fix CVE-2026-44400?

No fix has been published for CVE-2026-44400 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-44400 being exploited?

There is no known exploitation of CVE-2026-44400 in the wild and no public exploit code.

## Other vulnerabilities in Mailenable Mailenable

- [CVE-2015-9280](https://insights.sbomify.com/CVE-2015-9280/): XML external entity in n/a (critical 10.0)
- [CVE-2025-44148](https://insights.sbomify.com/CVE-2025-44148/): Cross-site scripting in n/a (critical 9.8)
- [CVE-2019-12924](https://insights.sbomify.com/CVE-2019-12924/): XML external entity in n/a (critical 9.8)
- [CVE-2015-9278](https://insights.sbomify.com/CVE-2015-9278/): MailEnable before 8.60 allows Privilege Escalation because admin accounts could be created as a consequence of %0A mishandling in AUTH.TAB a (critical 9.8)
- [CVE-2015-9277](https://insights.sbomify.com/CVE-2015-9277/): Path traversal in n/a (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-44400 and fix it if it is affected.

What it is: CVE-2026-44400 is a high-severity authentication bypass vulnerability in Mailenable Mailenable, published on 8 May 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-2026-44400 in the wild and no public exploit code.

Affected product: Mailenable Mailenable. 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-2026-44400/ (Markdown: https://insights.sbomify.com/CVE-2026-44400/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-44400
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-44400
- OSV: https://osv.dev/vulnerability/CVE-2026-44400

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-44400/
Summaries are generated and may contain mistakes; the official description above is the record.