CVE-2026-6411Network attack vector

Cross-tenant email disclosure via hardcoded AES key

Published May 7, 2026 · Updated May 7, 2026

Use of a hardcoded cryptographic key in MAXHUB Pivot Client Application before 1.36.2 allows remote attackers to read tenant email data. The Windows client embeds a reusable AES key that decrypts encrypted email addresses and related tenant metadata, while the MQTT enrollment workflow accepts unauthorized device registrations. No authentication or user interaction is required; cross-tenant disclosure and mass device enrollment can expose email data and interrupt tenant operations.

CVSS severity7.3
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of a hardcoded cryptographic key in MAXHUB Pivot Client Application before 1.36.2 allows remote attackers to read tenant email data. The Windows client embeds a reusable AES key that decrypts encrypted email addresses and related tenant metadata, while the MQTT enrollment workflow accepts unauthorized device registrations. No authentication or user interaction is required; cross-tenant disclosure and mass device enrollment can expose email data and interrupt tenant operations.

The record

CVE
CVE-2026-6411
Published
May 7, 2026
Updated
May 7, 2026
Vendor
MAXHUB
Product
MAXHUB Pivot Client Application
Classifications
CWE-327, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 7, 2026CVE publishedPublication date reported by the CVE source.
  2. May 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.36.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MAXHUB · MAXHUB Pivot Client Applicationversion=0 <1.36.2

Published CVSS scores

7.3ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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