CVE-2026-44400: MailEnable Enterprise Premium 10.55 and earlier contains an improper authorization vulnerability in the WebAdm

Q: How do I fix CVE-2026-44400?

mailenable: upgrade to 10.56. Exact commands for each OS are on this page.

Q: Is CVE-2026-44400 being exploited?

CVE-2026-44400 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-44400 affect?

CVE-2026-44400 affects mailenable. Severity is high (CVSS 8.1). 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-pr

Q: How urgent is CVE-2026-44400?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 8.1REMOTEUPGRADE

CVE-2026-44400 is a high-severity flaw (CVSS 8.1) affecting mailenable. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 72%)
CISA exploited list	No
Weakness	CWE-639
Published	2026-05-08
Last modified	2026-10-26

Publisher (CNA): VulnCheck · Vendor: mailenable

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-08 21:16 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

mailenable mailenable UPGRADE

Affected: < 10.56

Fixed in: 10.56

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mailenable || rpm -q mailenable || mailenable --version

2. UPGRADE to 10.56 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mailenable

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mailenable

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-44400?

mailenable: upgrade to 10.56. Exact commands for each OS are on this page.

Is CVE-2026-44400 being exploited?

CVE-2026-44400 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-44400 affect?

CVE-2026-44400 affects mailenable. Severity is high (CVSS 8.1). 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-pr

How urgent is CVE-2026-44400?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

References

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