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CVE-2026-81034— Netmaker through 1.6.0 Improper Certificate Validation in SMTP Client

Quick assessment

Affected
gravitl netmaker
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netmaker 在与已配置邮件服务器的连接中禁用了证书验证。在 中的发送方代码中，赋值的 TLS 配置将 字段无条件地设为 ，其下方紧跟一条注释，指出该设置在生产环境中应为 。没有任何配置项控制此行为，也没有任何代码路径恢复证书验证，因此客户端会接受邮件服务器提供的任意证书，包括由中间人（MITM）提供的证书。Netmaker 通过该连接发送的邮件包括携带一次性令牌的密码重置消息，以及携带注册链接的用户邀请邮件。因此，位于邮件服务器与其邮件中继器之间的中间人可以截获并读取这些传输中的邮件，并抢先使用被捕获的重置令

CVSS 6.5 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
gravitl netmaker ≤ 1.6.0 affected
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I. Basic Information for CVE-2026-81034

Vulnerability Information
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Vulnerability Title
Netmaker through 1.6.0 Improper Certificate Validation in SMTP Client
Source: CVE Program / CVE List V5
Vulnerability Description
Netmaker disables certificate verification on the connection to the configured mail server. The sender in pro/email/smtp.go assigns a TLS configuration whose skip-verify field is set to true unconditionally, directly beneath a comment stating that the setting should be false in production. No configuration value governs it and no code path restores verification, so the client accepts any certificate the mail server presents, including one an interposing party supplies. Mail that Netmaker sends over that connection includes password-reset messages carrying single-use tokens and user invitations carrying enrolment links, so a party positioned on the path between the server and its mail relay can read those messages in transit and use a captured reset token before the intended recipient does. The setting is absent from the development branch but present in the latest release.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
gravitl netmaker 0 ~ 1.6.0 -

II. Public POCs for CVE-2026-81034

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III. Intelligence Information for CVE-2026-81034

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Vendor Advisories for CVE-2026-81034 (1)

Proof of Concept for CVE-2026-81034 (2)

Other References for CVE-2026-81034 (1)

IV. Related Vulnerabilities

Same product: netmaker
Same vendor: gravitl
Same weakness: CWE-295

V. Comments for CVE-2026-81034

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