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CVE-2026-49217— Mailu missing authentication on PATCH /api/v1/token/<id>, which allows unauthenticated removal of IP restrictions

Quick assessment

Affected
Mailu Mailu
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mailu是mailu个人开发者开源的一款邮件服务器软件。 Mailu 2024.06.52之前版本存在授权问题漏洞，该漏洞源于Mailu admin REST API缺失授权检查，可能导致未经身份验证的攻击者在REST API启用的情况下移除IP限制或更新任何现有用户令牌的评论字段。

CVSS 7.5 · High EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1136.003 · Cloud Account

Affected Version Matrix 1

VendorProduct Version RangeStatus
Mailu Mailu < 2024.06.52 affected
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I. Basic Information for CVE-2026-49217

Vulnerability Information
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Vulnerability Title
Mailu missing authentication on PATCH /api/v1/token/<id>, which allows unauthenticated removal of IP restrictions
Source: CVE Program / CVE List V5
Vulnerability Description
Mailu is a mail server as a set of Docker images. Prior to version 2024.06.52, a missing authorization check in the Mailu admin REST API allows any unauthenticated attacker to remove any potential IP restriction or update the comment field from any existing user token provided the REST API is enabled. Upgrade to Mailu 2024.06.52 to receive a patch or, as a workaround, turn the REST API off.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A: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
Mailu 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mailu是mailu个人开发者开源的一款邮件服务器软件。 Mailu 2024.06.52之前版本存在授权问题漏洞，该漏洞源于Mailu admin REST API缺失授权检查，可能导致未经身份验证的攻击者在REST API启用的情况下移除IP限制或更新任何现有用户令牌的评论字段。
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
Mailu Mailu < 2024.06.52 -

II. Public POCs for CVE-2026-49217

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Reproduction recording is a Pro+ exclusive
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claude_code · 7130 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-49217

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Vendor Advisories for CVE-2026-49217 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-49217

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