CVE-2026-121937

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    CVE-2026-121937

    Published: 4 Nov 2026Last Modified: 8 Nov 2026

    Summary: loonflow before r3.2.3 IDOR via ticket_flow_history Endpoint

    Details: loonflow before r3.2.3 contains a missing authorization vulnerability in TicketFlowHistoryView that allows any authenticated user to read other users' ticket flow history by supplying a ticket UUID. Attackers can request the ticket_flow_history endpoint, which skips ticket_view_permission_check, to obtain approval comments and processor names, emails and phone numbers.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121937.json, https://hackmd.io/@hieuPenguinnn/loonflow-ticket-flow-history-idor, https://nvd.nist.gov/vuln/detail/CVE-2026-121937, https://www.vulncheck.com/advisories/loonflow-before-r3-2.3-idor-via-ticket-flow-history-endpoint, https://github.com/blackholll/loonflow/issues/591, https://github.com/blackholll/loonflow/commit/a6495b0c2ca9e5dede8e49217a0468bcfa946de4, https://github.com/blackholll/loonflow, https://github.com/blackholll/loonflow/blob/r3.2.2/backend/apps/ticket/views.py#L265-L286, https://hackmd.io/@hieuPenguinnn/cve-2026-121937-loonflow-ticket-flow-history-idor

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -219df1f72c6cbbf2d99639c1b072b9a3c923a2ac

    Affected versions

    r3.2.2
    r3.2.1
    r3.2.0

    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-2026-121937 | CVE-DB