CVE-2026-41189: FreeScout has assigned-only visibility bypass that allows editing hidden customer-authored threads

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-21 · updated 2026-06-17
Weakness: CWE-863

Description

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.215, customer-thread editing is authorized through `ThreadPolicy::edit()`, which checks mailbox access but does not apply the assigned-only restriction from `ConversationPolicy`. A user who cannot view a conversation can still load and edit customer-authored threads inside it. Version 1.8.215 fixes the vulnerability.

Affected products

freescout-help-desk freescout: before 1.8.215

References

https://github.com/freescout-help-desk/freescout/commit/cdadaf621bb1e1d017315df20d743671f7eae7a9
https://github.com/freescout-help-desk/freescout/releases/tag/1.8.215
https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-4h5p-7f5c-q7gj

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