Vulnerability · Published Apr 21, 2026 · Assigned by GitHub_M

CVE-2026-40589FreeScout has Customer Edit Cross-Mailbox Email Takeover

High 7.6

In plain English

A high-severity authorization bypass via user-controlled key in freescout from freescout-help-desk. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).

Severity (CVSS 3.1)7.6High

Exploit odds (30 days)0.2%top 85.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.214, a low-privileged agent can edit a visible customer and add an email address already owned by a hidden customer in another mailbox. The server discloses the hidden customer’s name and profile URL in the success flash, reassigns the hidden email to the visible customer, and rebinds hidden-mailbox conversations for that email to the visible customer. Version 1.8.214 fixes the issue.

Affected products (as reported)

Vendor	Product	Versions
freescout-help-desk	freescout	< 1.8.214

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

References

https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-mv55-3mgv-fxwr x_refsource_CONFIRM
https://github.com/freescout-help-desk/freescout/commit/2e2fe37111d92ac665b9ad8806eac94a1a3e502c x_refsource_MISC
https://github.com/freescout-help-desk/freescout/releases/tag/1.8.214 x_refsource_MISC