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    CVE-2026-42276

    Onyx is an open-source AI platform. Prior to versions 3.0.9, 3.1.6, and 3.2.6, the POST /chat/stop-chat-session/{chat_session_id} endpoint lets any authenticated user stop any other user's active chat session. The endpoint checks authentication but never verifies the session belongs to the caller. An attacker who knows a chat session UUID can kill another user's LLM generation mid-stream. This issue has been patched in versions 3.0.9, 3.1.6, and 3.2.6.

    Published:May 8, 2026
    Last Modified:May 12, 2026
    EPS:May 8, 2026
    EPSS Score:0.00045
    CVSS Score:4.3

    Affected Products

    Vendor
    Onyx
    Product
    Onyx

    Exploits

    https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-rw6w-hp62-gc8whttps://github.com/onyx-dot-app/onyx/security/advisories/GHSA-rw6w-hp62-gc8w

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    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