CVE-2026-118691

EUVD-2026-112492
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
3.7 LOW
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Common Weakness Enumeration
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
https://www.vulncheck.com/advisories/xianyu-auto-reply-fix-through-2.0.7-unauthenticated-message-sending-via-send-message