What is CVE-2026-53591?

CVE-2026-53591 is a high-severity vulnerability in Freescout-help-desk Freescout, classified under Improper Authentication. CVSS score: 8.6/10. Published 2026-07-20.

How severe is CVE-2026-53591?

High severity. CVSS v3 base score is 8.6 out of 10.

Auth bypass in Freescout-help-desk Freescout

CVE-2026-53591

FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.223, an unauthenticated attacker can inject messages into any existing support conversation by sending a single email to the helpdesk's…

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L.

Affected products

Freescout-help-desk Freescout — versions < 1.8.223

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-53591?: CVE-2026-53591 is a high-severity vulnerability in Freescout-help-desk Freescout, classified under Improper Authentication. CVSS score: 8.6/10. Published 2026-07-20.
How severe is CVE-2026-53591?: High severity. CVSS v3 base score is 8.6 out of 10.