What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.9 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-862

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

• freescout-help-desk freescout: before 1.8.214

References

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

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