---
id: CVE-2026-121937
title: loonflow before r3.2.3 IDOR via ticket_flow_history Endpoint
summary: >-
  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_…
severity: low
cvss: 3.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-639
vendor: blackholll
product: loonflow
affected:
  - loonflow < r3.2.3
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-04T18:55:17.049546Z'
exploitAvailable: true
published: '2026-11-04'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T18:55:42.235Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121937'
references:
  - url: 'https://github.com/blackholll/loonflow/issues/591'
  - url: 'https://hackmd.io/@hieuPenguinnn/loonflow-ticket-flow-history-idor'
  - url: >-
      https://github.com/blackholll/loonflow/commit/a6495b0c2ca9e5dede8e49217a0468bcfa946de4
  - url: >-
      https://github.com/blackholll/loonflow/blob/r3.2.2/backend/apps/ticket/views.py#L265-L286
  - url: >-
      https://www.vulncheck.com/advisories/loonflow-before-r3-2.3-idor-via-ticket-flow-history-endpoint
    label: >-
      VulnCheck Advisory: loonflow before r3.2.3 IDOR via ticket_flow_history
      Endpoint
tags:
  - cve.org
  - exploit-available
ingestedAt: '2026-11-05T21:36:00.511Z'
epss: 0.0032
epssPercentile: 0.25134
---

## Overview

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.

## Affected

- `loonflow < r3.2.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.