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CVE-2026-107568— Missing Authorization in hMailServer

Quick assessment

Affected
Progressive Robot Ltd hMailServer
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.

Progressive Robot hMailServer 在 Sieve 通知动作（版本 6.2.22 至 6.3.6）以及邮件规则中的回复动作（版本 6.0.0 至 6.3.6）中存在授权缺失漏洞。该漏洞允许已认证用户通过服务器以任意邮箱地址发送邮件。 Sieve 通知动作会发送通知邮件，其 标签指定发件人；服务器在设置通知邮件的 From 头时，直接沿用脚本中写明的 值，而未验证该地址是否属于当前账户。相比之下，Sieve 度假（vacation）动作会对自身的 执行此类验证，且服务器会对通过 COM 接口入

CVSS 6.5 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
Progressive Robot Ltd hMailServer 6.0.0≤ 6.3.6 affected
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I. Basic Information for CVE-2026-107568

Vulnerability Information
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Vulnerability Title
Missing Authorization in hMailServer
Source: CVE Program / CVE List V5
Vulnerability Description
Missing authorization in the Sieve notify action (6.2.22 through 6.3.6) and in the mail-rule Reply action (6.0.0 through 6.3.6) of Progressive Robot hMailServer allows an authenticated user to send mail through the server as any address. A Sieve notify sends a notification message, and its :from tag names the sender; the server set the notification's From header to that :from as the script wrote it, without checking that the address belongs to the account - the check that the Sieve vacation action applies to its own :from, and that the server applies to the sender of mail queued over COM or sent from the webmail. An account that can store a Sieve script (over ManageSieve, the REST API's self-service filter, or the administration interface) could therefore have the server send a notification from any address, on this server or anywhere; and where the claimed address is at a domain the server hosts with DKIM signing enabled, the server signed the notification with that domain's DKIM key, because it signs by the From header's domain, producing forged mail aligned to pass the domain's DMARC policy. The notify action and this behaviour were introduced in 6.2.22. In the mail-rule engine, a rule's Reply was likewise sent from whatever address the action named, whoever the rule belonged to, so that an account acting on its own rules over COM, a domain administrator, or an API key confined to a domain (over the REST API from 6.3.4) could have a domain's or an account's rule reply from any address, signed, where that address is at a domain the server hosts with DKIM signing enabled, with that domain's key.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Progressive Robot Ltd hMailServer 6.0.0 ~ 6.3.6 -

II. Public POCs for CVE-2026-107568

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III. Intelligence Information for CVE-2026-107568

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Other References for CVE-2026-107568 (2)

Same Patch Batch · Progressive Robot Ltd · 2026-10-19 · 5 CVEs total

CVE-2026-107571 7.8 HIGH Incorrect Default Permissions in hMailServer
CVE-2026-107567 7.5 HIGH Use of Less Trusted Source in hMailServer
CVE-2026-107569 7.5 HIGH Unchecked Input for Loop Condition in hMailServer
CVE-2026-107566 6.5 MEDIUM Missing Authorization in hMailServer

IV. Related Vulnerabilities

Same product: hMailServer
Same vendor: Progressive Robot Ltd
Same weakness: CWE-862

V. Comments for CVE-2026-107568

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