CVE-2026-81034Network attack vector

Email interception via disabled SMTP certificate verification

Published Aug 26, 2026 · Updated Aug 26, 2026

Improper certificate validation in Netmaker 1.6.0 and earlier allows man-in-the-middle attackers to intercept outbound SMTP email. The Pro email sender in pro/email/smtp.go unconditionally sets InsecureSkipVerify to true, causing the SMTP client to accept every presented certificate. Exploitation requires an on-path position between the Netmaker server and its mail relay and exposes reset tokens and invitation links in transit.

CVSS severity8.3
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

Improper certificate validation in Netmaker 1.6.0 and earlier allows man-in-the-middle attackers to intercept outbound SMTP email. The Pro email sender in pro/email/smtp.go unconditionally sets InsecureSkipVerify to true, causing the SMTP client to accept every presented certificate. Exploitation requires an on-path position between the Netmaker server and its mail relay and exposes reset tokens and invitation links in transit.

The record

CVE
CVE-2026-81034
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
Gravitl
Product
Netmaker
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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 <=1.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Gravitl · Netmakerversion=0 <=1.6.0

Published CVSS scores

6.5Netmaker issue reporterCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
8.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

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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