---
id: "CVE-2026-62851"
page: "https://infrastack.ai/live/CVE-2026-62851"
kind: "vulnerability"
aliases: ["CVE-2026-62851"]
title: "FreeScout: agents can confirm tickets in other mailboxes via search"
severity: "medium"
cvss: 4.3
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["freescout", "package", "php", "self-hosted"]
not_affected_if: ["managed-hosting", "single-mailbox", "version-1.8.226-or-later"]
published_at: "2026-11-06T17:18:33+00:00"
first_seen_at: "2026-11-06T17:43:14+00:00"
updated_at: "2026-11-06T17:45:37+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-62851", "first_seen_at": "2026-11-06T17:43:14+00:00"}]
exploit_sources: []
---

# FreeScout: agents can confirm tickets in other mailboxes via search

Link for people: https://infrastack.ai/live/CVE-2026-62851 (this .md is for agents)

FreeScout's search-by-ticket-number shortcut skips the mailbox access check, so a logged-in agent can tell whether a conversation exists in a mailbox they cannot open. The attacker learns internal conversation and folder identifiers, but not message content, attachments, or customer data.

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

## How to check

- Check the installed FreeScout version and compare it with `1.8.226`
- Look for mailboxes whose agents should not see each other's conversations, since those are the setups where this matters

## Fix

- FreeScout: upgrade to `1.8.226` or later

## Timeline

- 2026-11-06T17:43:14+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-62851

## Documents

- [advisory] Vendor advisory: github.com https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-wqq7-4q7m-273v
- [fix] Patch: github.com https://github.com/freescout-help-desk/freescout/commit/4e197d8ce97eb6610ef71402d8c2512824a9a1b5
- [fix] Release notes: github.com https://github.com/freescout-help-desk/freescout/releases/tag/1.8.226

## From the sources

FreeScout is a self-hosted help desk and shared mailbox. Prior to 1.8.226, the search-by-number shortcut in ConversationsController::search() resolves a user-controlled ticket number without applying the mailbox filter or view policy used by the normal search path. An authenticated non-admin agent who is a member of at least one mailbox can request /search with a hash-prefixed ticket number and use the 302 Location header to confirm that a conversation exists in a different mailbox the agent cannot access and learn its internal conversation and folder identifiers. The destination conversation remains protected, so this issue does not disclose message content, attachments, or customer data. This issue is fixed in version 1.8.226.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_