GuDong2003 xianyu-auto-reply-fix up to 2.0.7 Message Endpoint api_key/cookie_id/chat_id/to_user_id/message improper authorization

Summaryinfo

A vulnerability, which was classified as problematic, was found in GuDong2003 xianyu-auto-reply-fix up to 2.0.7. This issue affects some unknown processing of the component Message Endpoint. Such manipulation of the argument api_key/cookie_id/chat_id/to_user_id/message leads to improper authorization. This vulnerability is traded as CVE-2026-118691. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in GuDong2003 xianyu-auto-reply-fix up to 2.0.7 and classified as problematic. Affected by this issue is some unknown functionality of the component Message Endpoint. The manipulation of the argument api_key/cookie_id/chat_id/to_user_id/message with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-118691 since 10/28/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/28/2026). This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• GuDong2003

Name

• xianyu-auto-reply-fix

Version

• 2.0.0
• 2.0.1
• 2.0.2
• 2.0.3
• 2.0.4
• 2.0.5
• 2.0.6
• 2.0.7

Website

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

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