What is CVE-2026-40497?

CVE-2026-40497 is a high-severity vulnerability in Freescout-help-desk Freescout, classified under Cross-site Scripting. CVSS score: 8.1/10. Published 2026-04-21.

How severe is CVE-2026-40497?

High severity. CVSS v3 base score is 8.1 out of 10.

XSS in Freescout-help-desk Freescout

CVE-2026-40497

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, FreeScout's `Helper::stripDangerousTags()` removes `<script>`, `<form>`, `<iframe>`, `<object>` but does NOT strip `<style>` tags. The mailbox signatur…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (13.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N.

Affected products

Freescout-help-desk Freescout — versions < 1.8.213

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-fh99-wr77-pxq3 (x_refsource_CONFIRM)
https://github.com/freescout-help-desk/freescout/commit/5aa8d633216f65995e80a7d4a921b784acc94df4 (x_refsource_MISC)
https://github.com/freescout-help-desk/freescout/releases/tag/1.8.213 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-40497?: CVE-2026-40497 is a high-severity vulnerability in Freescout-help-desk Freescout, classified under Cross-site Scripting. CVSS score: 8.1/10. Published 2026-04-21.
How severe is CVE-2026-40497?: High severity. CVSS v3 base score is 8.1 out of 10.