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CVE-2026-13164— Unauthenticated self-registration in MailerUp allows access to stored email data

AI Predicted 9.8 Difficulty: Trivial EPSS 0.41% · P34

Possible ATT&CK Techniques 1AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProductVersion RangeStatus
MailerupMailerup< 1.0.1affected
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I. Basic Information for CVE-2026-13164

Vulnerability Information
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Vulnerability Title
Unauthenticated self-registration in MailerUp allows access to stored email data
Source: CVE Program / CVE List V5
Vulnerability Description
Missing Authentication for Critical Function (CWE-306) in the RegisterView (apps/accounts/views.py), exposed at POST /api/auth/register/, in MailerUp <1.0.1 allows a remote, unauthenticated attacker to self-register a working account on instances where registration is intended to be restricted, because the endpoint applies the AllowAny permission with no email verification, CAPTCHA, or administrator approval. Any account created this way can read all email stored by the instance, resulting in full disclosure of stored messages to an arbitrary unauthenticated attacker
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Mario MailerUp 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mario MailerUp是Mario个人开发者的一款邮件服务器软件。 Mario MailerUp 1.0.1之前版本存在授权问题漏洞，该漏洞源于缺少对关键功能的身份验证，可能导致远程未经身份验证的攻击者在注册受限的实例上自行注册有效账户，因为端点应用了AllowAny权限且无邮件验证、验证码或管理员批准，任何以此方式创建的账户均可读取实例存储的所有邮件，导致存储消息完全泄露给任意的未经身份验证的攻击者。
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

VendorProductAffected VersionsCPESubscribe
MailerupMailerup 0 ~ 1.0.1 -

II. Public POCs for CVE-2026-13164

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III. Intelligence Information for CVE-2026-13164

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Patches & Fixes for CVE-2026-13164 (1)

News Coverage for CVE-2026-13164 (1)

IV. Related Vulnerabilities

Same product: Mailerup
Same vendor: Mailerup
Same weakness: CWE-306

V. Comments for CVE-2026-13164

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