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 4.0

6.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

CWE

CWE-1188

Published

2026-10-28

Modified

2026-10-28

Record from

the NVD, synced 2026-10-28

References

• 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

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