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CVE-2026-118691— xianyu-auto-reply-fix through 2.0.7 Unauthenticated Message Sending via /send-message

Quick assessment

Affected
GuDong2003 xianyu-auto-reply-fix
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.

xianyu-auto-reply-fix 2.0.7 及以下版本在 POST /send-message 接口中存在授权缺失漏洞。由于使用了公开已知的默认 API 密钥，未认证的攻击者可以利用硬编码的 api_key，结合其他用户的 cookie_id，并指定 chat_id、to_user_id 及消息内容，从而冒充该商家账户向买家发送任意闲鱼消息。

CVSS 3.7 · Low EPSS 0.31% · P24

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
GuDong2003 xianyu-auto-reply-fix ≤ 2.0.7 affected
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I. Basic Information for CVE-2026-118691

Vulnerability Information
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Vulnerability Title
xianyu-auto-reply-fix through 2.0.7 Unauthenticated Message Sending via /send-message
Source: CVE Program / CVE List V5
Vulnerability Description
xianyu-auto-reply-fix through 2.0.7 contains a missing authorization vulnerability in the POST /send-message endpoint that allows unauthenticated attackers to send messages from other users' accounts using publicly known default API secrets. Attackers can supply the hard-coded api_key and another user's cookie_id, plus chosen chat_id, to_user_id and message values, to send arbitrary Xianyu messages to buyers from that merchant account.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不安全的默认资源初始化
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
GuDong2003 xianyu-auto-reply-fix 0 ~ 2.0.7 -

II. Public POCs for CVE-2026-118691

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-118691

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Patches & Fixes for CVE-2026-118691 (1)

Vendor Advisories for CVE-2026-118691 (1)

Other References for CVE-2026-118691 (2)

Other References for CVE-2026-118691 (2)

IV. Related Vulnerabilities

Same weakness: CWE-1188