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CVE-2026-44400

MailEnable Enterprise Premium < 10.55 Authorization Bypass via WebAdmin

Published: May 8, 2026Updated: Jun 1, 2026 Sources: CVE List NVDCWE-639
NVD MITRE
8.1CVSSHIGH
EPSS Score
0.4%
Top 73.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-639

Affected Products

mailenablemailenable
On-premWeb App
Communications / email-server-client
MailEnable Enterprise PremiumMailEnable
On-prem
Communications / email-server-client
mailenablecommercialAUCommunicationsaka mail enable

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://www.mailenable.com/Premium-ReleaseNotes.txt
mailenable.com
https://www.vulncheck.com/advisories/mailenable-enterprise-premium-authorization-bypass-via-webadmin
vulncheck.com

Timeline

Published
May 8, 2026
Last Updated
Jun 1, 2026

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