CVE-2026-118691

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.

CVSS v3 3.7 LOW

3.7^/10

CVSS v3 : LOW

Vector :

Exploitability : 2.2 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/GuDong2003/xianyu-auto-reply-fix
https://github.com/GuDong2003/xianyu-auto-reply-fix/blob/v2.0.7/db_manager.py#L1011
https://github.com/GuDong2003/xianyu-auto-reply-fix/blob/v2.0.7/reply_server.py#L2347-L2475
https://github.com/GuDong2003/xianyu-auto-reply-fix/commit/999cfe61c401322d9893eb81ad1a76beabba6cfb
https://github.com/GuDong2003/xianyu-auto-reply-fix/issues/116
https://www.vulncheck.com/advisories/xianyu-auto-reply-fix-through-2.0.7-unauthenticated-message-sending-via-send-message

Configurations

No configuration.

History

28 Oct 2026, 22:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-28 22:17

Updated : 2026-10-29 16:21

NVD link : CVE-2026-118691

Mitre link : CVE-2026-118691

CVE.ORG link : CVE-2026-118691

JSON object : View

Products Affected

No product.

CWE

CWE-1188

Initialization of a Resource with an Insecure Default

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