CVE-2026-118691

medium

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.

References

https://www.vulncheck.com/advisories/xianyu-auto-reply-fix-through-2.0.7-unauthenticated-message-sending-via-send-message

https://github.com/GuDong2003/xianyu-auto-reply-fix/issues/116

https://github.com/GuDong2003/xianyu-auto-reply-fix/commit/999cfe61c401322d9893eb81ad1a76beabba6cfb

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/blob/v2.0.7/db_manager.py#L1011

https://github.com/GuDong2003/xianyu-auto-reply-fix

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-112492

Details

Source: Mitre, NVD

Published: 2026-10-28

Updated: 2026-10-29

Risk Information

CVSS v2

Base Score: 2.6

Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:P/A:N

Severity: Low

CVSS v3

Base Score: 3.7

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

Severity: Low

CVSS v4

Base Score: 6.3

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

Severity: Medium

EPSS

EPSS: 0.00309