CVE-2026-40020
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro | ≤ 2.3.0 | affected |
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I. Basic Information for CVE-2026-40020
Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Description
Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imap_acl_allow_anyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed version. No publicly available exploits are known.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
访问控制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Open-Xchange OX Dovecot Pro 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open-Xchange OX Dovecot Pro是德国Open-Xchange公司的一个邮件存储与投递系统。 Open-Xchange OX Dovecot Pro存在访问控制错误漏洞，该漏洞源于IMAP SETACL命令可注入anyone权限到用户dovecot-acl文件，即使imap_acl_allow_anyone=no设置，导致文件夹被垃圾邮件发送给所有用户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro | 0 ~ 2.3.0 | - |
II. Public POCs for CVE-2026-40020
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Open-Xchange GmbH · 2026-05-12 · 5 CVEs total
| CVE-2026-27851 | 7.4 HIGH | Open-Xchange OX Dovecot Pro 安全漏洞 |
| CVE-2026-33603 | 6.8 MEDIUM | Open-Xchange OX Dovecot Pro 安全漏洞 |
| CVE-2026-40016 | 5.3 MEDIUM | Open-Xchange OX Dovecot Pro 资源管理错误漏洞 |
| CVE-2026-42006 | 4.3 MEDIUM | Open-Xchange OX Dovecot Pro 资源管理错误漏洞 |
IV. Related Vulnerabilities
Same weakness: CWE-284
- CVE-2026-45301
Open WebUI: Missing permission check in files API allows aut - CVE-2026-44556
Open WebUI: responses passthrough endpoint lacks access cont - CVE-2026-44774
Traefik: Gateway API TraefikService backend accepts rest@int - CVE-2025-0040
NXP JTAG-AXI访问控制漏洞 - CVE-2026-44478
hoppscotch: Unauthenticated Onboarding Config Disclosure via
V. Comments for CVE-2026-40020
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