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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 是一个由一组 Docker 镜像组成的邮件服务器。在版本 2024.06.52 之前，Mailu 管理员 REST API 中缺少授权检查，导致任何未经验证的攻击者在启用 REST API 的情况下，都可以移除任何潜在的 IP 限制，或更新任何现有用户令牌中的评论字段。建议升级到 Mailu 2024.06.52 以获取补丁，或者作为临时解决方案，请关闭 REST API。

CVSS 7.5 · High EPSS 0.25% · P17

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

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
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Qwen3.6-35B-A3B · 7130 chars
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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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