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.
Published: 2026-10-28
Score: 6.3 Medium
EPSS: n/a
KEV: No
AI Analysis

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Remediation

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Advisories

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History

Wed, 28 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
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.
Title xianyu-auto-reply-fix through 2.0.7 Unauthenticated Message Sending via /send-message
Weaknesses CWE-1188
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'}

cvssV4_0

{'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'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-28T21:11:18.629Z

Reserved: 2026-10-28T17:31:29.498Z

Link: CVE-2026-118691

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-28T22:17:13.217

Modified: 2026-10-28T22:17:13.217

Link: CVE-2026-118691

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-28T22:30:12Z

Weaknesses
  • CWE-1188

    Initialization of a Resource with an Insecure Default