Auth bypass in Freescout-help-desk Freescout
CVE-2026-40591
FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.214, the phone-conversation creation flow accepts attacker-controlled `customer_id`, `name`, `to_email`, and `phone` values and resolves the target customer…
Vulnerability class: IDOR (Insecure Direct Object Reference)
EPSS: 0.000 (9.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N.
Affected products
- Freescout-help-desk Freescout — versions < 1.8.214
Weakness classification (CWE)
References
- https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-9ff4-mmhv-x6jp (x_refsource_CONFIRM)
- https://github.com/freescout-help-desk/freescout/commit/83eea1ca47d97c6cdc90c501734bc2579b014a34 (x_refsource_MISC)
- https://github.com/freescout-help-desk/freescout/releases/tag/1.8.214 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-40591?
- CVE-2026-40591 is a high-severity vulnerability in Freescout-help-desk Freescout, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.1/10. Published 2026-04-21.
- How severe is CVE-2026-40591?
- High severity. CVSS v3 base score is 7.1 out of 10.