What’s Vulnerable › Vulnerabilities

CVE-2026-107393: FreeScout: Stored HTML Injection in Administrator Alert Emails via Spoofed CF-Connecting-IP Header

• Severity: medium (CVSS 6.1 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: 2026-10-08 · updated 2026-10-14
• Weakness: CWE-79

Description

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.

Affected products

• freescout-help-desk freescout: before 1.8.235

References

• https://github.com/freescout-help-desk/freescout/commit/0f41f5cabb581de156ec8eb344ff6c0e6e0cc66a
• https://github.com/freescout-help-desk/freescout/releases/tag/1.8.235
• https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-9cm3-qvj2-8hg4
• https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-9cm3-qvj2-8hg4

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