---
id: "CVE-2026-121937"
kind: "vulnerability"
aliases: ["CVE-2026-121937"]
title: "loonflow: any logged-in user can read other users' ticket history"
severity: "low"
cvss: 3.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["loonflow", "package", "self-hosted", "ticketing"]
not_affected_if: ["single-user-deployment", "version-r3.2.3-or-later"]
published_at: "2026-11-04T13:17:27+00:00"
first_seen_at: "2026-11-04T13:27:01+00:00"
updated_at: "2026-11-04T13:28:13+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121937", "first_seen_at": "2026-11-04T13:27:01+00:00"}]
---

# loonflow: any logged-in user can read other users' ticket history

Loonflow, a ticket workflow system, skips its ticket permission check on the ticket flow history endpoint. Any authenticated user who knows a ticket UUID can read approval comments and processor names, emails and phone numbers.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Loonflow version; affected builds are before `r3.2.3`.
- Look for the `ticket_flow_history` endpoint in your deployment and confirm whether it is reachable by ordinary logged-in users.

## Fix

- Upgrade Loonflow to `r3.2.3` or later.

## Timeline

- 2026-11-04T13:27:01+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121937

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/loonflow-before-r3-2.3-idor-via-ticket-flow-history-endpoint
- [fix] Patch: github.com https://github.com/blackholll/loonflow/commit/a6495b0c2ca9e5dede8e49217a0468bcfa946de4

## From the sources

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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_