Security readout for executives and security teams
Plain-English summary
MailEnable Enterprise Premium has a high-risk authorization flaw in WebAdmin. A low-privileged authenticated user may be able to reuse a WebMail authentication token against WebAdmin and perform administrative actions. This can turn a limited mailbox account into broad mail-platform control if WebAdmin is reachable.
Executive priority
Treat as urgent for any exposed MailEnable Enterprise Premium deployment. The business risk is unauthorized mail-system administration, including disruption or sensitive mail access. Prioritize upgrade and exposure reduction before routine maintenance windows if WebAdmin is internet-facing.
Technical view
The issue is an improper authorization vulnerability in the WebAdmin mobile portal. Sources describe reuse of AuthenticationToken cookies created through WebMail persistent login, allowing privilege boundary bypass into WebAdmin. CVSS 4.0 is 8.7, network exploitable, low privileges required, no user interaction, with high confidentiality, integrity, and availability impact.
Likely exposure
Organizations running MailEnable Enterprise Premium with WebMail and WebAdmin enabled are the relevant exposure group. Internet-facing WebAdmin or WebMail increases urgency. The source bundle is inconsistent on the exact affected boundary, citing both “< 10.55” and “10.55 and earlier,” so verify vendor release notes.
Exploitation context
The CVE is not listed as CISA KEV in the supplied bundle, and no provided source states active exploitation. The described attack requires a low-privileged user token and reachable WebAdmin/WebMail surfaces, but no exploit maturity evidence is provided.
Researcher notes
This maps to CWE-639 and appears to be an authorization boundary failure between WebMail-issued tokens and WebAdmin authorization checks. Public evidence supports high impact but not active exploitation. The affected-version metadata is incomplete or inconsistent, so version validation should rely on vendor and advisory text.
Mitigation direction
- Review MailEnable Premium release notes for the fixed version and upgrade promptly.
- Restrict WebAdmin access to trusted administrative networks or VPN paths.
- Reduce external exposure of WebMail and WebAdmin where business operations allow.
- Review administrative activity for unexpected changes from low-privileged account contexts.
- Follow MailEnable guidance if the vendor publishes additional mitigations.
Validation and detection
- Inventory MailEnable Enterprise Premium versions across all mail servers.
- Confirm whether WebAdmin mobile portal and WebMail are externally reachable.
- Check whether installed builds fall within the advisory’s affected range.
- Review logs for low-privileged sessions followed by administrative WebAdmin actions.
- Validate remediation against vendor release notes, not only package naming.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-639: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-44400 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: 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
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
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——VulnCheckCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.25.9VulnCheckVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: 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
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.mailenable.com/Premium-ReleaseNotes.txtCVE reference, VulnCheck · release-notes
- https://www.vulncheck.com/advisories/mailenable-enterprise-premium-authorization-bypass-via-webadminCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Authorization Bypass Through User-Controlled Key
Authorization Bypass Through User-Controlled Key represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.