Vulnerability · Published Apr 21, 2026 · Assigned by GitHub_M

CVE-2026-40592FreeScout's cross-user undo reply allows mailbox peers to recall another agent's outbound reply

Medium 5.9

In plain English

A medium-severity missing authorization in freescout from freescout-help-desk. There are no confirmed reports of exploitation so far. 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)5.9Medium

Exploit odds (30 days)0.2%top 85.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.214, the undo-send route `GET /conversation/undo-reply/{thread_id}` checks only whether the current user can view the parent conversation. It does not verify that the current user created the reply being undone. In a shared mailbox, one agent can therefore recall another agent's just-sent reply during the 15-second undo window. Version 1.8.214 fixes the vulnerability.

Affected products (as reported)

Vendor	Product	Versions
freescout-help-desk	freescout	< 1.8.214

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L

References

https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-674v-r6xp-mvp6 x_refsource_CONFIRM
https://github.com/freescout-help-desk/freescout/commit/c779afdda86fa00a4b85779e034bbfd9ce20c76d x_refsource_MISC
https://github.com/freescout-help-desk/freescout/releases/tag/1.8.214 x_refsource_MISC