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CVE-2026-86009— Mailu: Domain managers can allow themselves to spoof on other hosted domains they should not control

Quick assessment

Affected
Mailu Mailu
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.

Mailu 是一套以 Docker 镜像形式分发的邮件服务器。在提交 f05aeb8322e2f61096af6b089d61ba6f40587d96 之前，域管理员可以为其未掌控的托管域启用伪造（spoofing）功能。潜在恶意的域管理员可为其他托管域启用伪造，从而发送经过 DKIM/SPF 认证的邮件，而这些域本不应由其认证。该漏洞已在提交 f05aeb8322e2f61096af6b089d61ba6f40587d96 中得到修复。

CVSS 8.2 · High EPSS 0.30% · P21

Affected Version Matrix 1

VendorProduct Version RangeStatus
Mailu Mailu < f05aeb8322e2f61096af6b089d61ba6f40587d96 affected
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I. Basic Information for CVE-2026-86009

Vulnerability Information
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Vulnerability Title
Mailu: Domain managers can allow themselves to spoof on other hosted domains they should not control
Source: CVE Program / CVE List V5
Vulnerability Description
Mailu is a mail server distributed as a set of Docker images. Prior to f05aeb8322e2f61096af6b089d61ba6f40587d96, domain managers can enable spoofing for hosted domains they do not control. A potentially malicious domain administrator enables spoofing for another hosted domain and can send emails that are authenticated with DKIM/SPF for domains they should not be able to. This vulnerability is addressed by f05aeb8322e2f61096af6b089d61ba6f40587d96.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mailu Mailu < f05aeb8322e2f61096af6b089d61ba6f40587d96 -

II. Public POCs for CVE-2026-86009

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III. Intelligence Information for CVE-2026-86009

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Patches & Fixes for CVE-2026-86009 (2)

Vendor Advisories for CVE-2026-86009 (1)

Vendor Pages for CVE-2026-86009 (1)

IV. Related Vulnerabilities

Same product: Mailu
Same vendor: Mailu
Same weakness: CWE-285

V. Comments for CVE-2026-86009

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