CVE-2026-118691

    Dashboard / Vulnerabilities / CVE-2026-118691

    CVE-2026-118691

    Published: 28 Oct 2026Last Modified: 5 Nov 2026

    Summary: xianyu-auto-reply-fix through 2.0.7 Unauthenticated Message Sending via /send-message

    Details: 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://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118691.json, https://nvd.nist.gov/vuln/detail/CVE-2026-118691, 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, 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://hackmd.io/@hieuPenguinnn/xianyu-auto-reply-default-secret-cross-user-message-send

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -999cfe61c401322d9893eb81ad1a76beabba6cfb

    Affected versions

    v2.0.7
    v2.0.6
    v2.0.5
    v2.0.4
    v2.0.3
    v2.0.2
    v2.0.1
    v2.0.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-118691 | CVE-DB