What is CVE-2026-107393?

CVE-2026-107393 is a medium-severity vulnerability in Freescout-Help-Desk Freescout, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-10-08.

How severe is CVE-2026-107393?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Freescout-Help-Desk Freescout

CVE-2026-107393

FreeScout is a self-hosted help desk and shared mailbox. Prior to 1.8.235, when APP_CLOUDFLARE_IS_USED is enabled, FreeScout trusts an unvalidated CF-Connecting-IP header during failed login attempts and stores the spoofed value in the activity log. LogsMonitor inserts the value into an administrator alert email without HTML escaping, allowing injected HTML to execute when an administrator opens the email. This issue is fixed in version 1.8.235.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-08 · last modified 2026-10-08.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Freescout-Help-Desk Freescout — versions < 1.8.235

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-107393?: CVE-2026-107393 is a medium-severity vulnerability in Freescout-Help-Desk Freescout, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-10-08.
How severe is CVE-2026-107393?: Medium severity. CVSS v3 base score is 6.1 out of 10.