TI-2026-69735 Aliases CVE-2026-107393

Stored HTML injection in FreeScout alert emails via spoofed header

MEDIUM 60CWE-116Published 2026-10-08 · Updated 2026-10-14

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

FreeScout versions before 1.8.235 are affected when APP_CLOUDFLARE_IS_USED is enabled. The application trusts an unvalidated CF-Connecting-IP header on failed login attempts and stores the spoofed value in the activity log. LogsMonitor inserts that value into an administrator alert email without HTML escaping (CWE-79), so injected HTML runs when an administrator opens the email. An unauthenticated remote attacker needs an administrator to open that alert email.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.0023 13th percentileScored 2026-11-07

Fix Fixed freescout (freescout-help-desk): 1.8.235

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
freescout-help-desk	freescout	before 1.8.235	1.8.235	Patch available	CNA

freescout Vendorfreescout-help-desk Affected before 1.8.235 Fixed in 1.8.235 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:freescout:freescout::::::::	—	—	freescout-help-desk

cpe:2.3:a:freescout:freescout:*:*:*:*:*:*:*:* Versions — — ·freescout-help-desk

Remediation

Upgrade FreeScout to version 1.8.235, the version that fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Fix · CNA freescout (freescout-help-desk) Fixed in 1.8.235

Timeline

2026-10-09 Threatist record created from CVE-2026-107393
2026-10-10 Priority changed: MEDIUM → LOW
2026-10-14 CISA SSVC decision points changed
2026-10-14 Priority changed: LOW → MEDIUM

References

Other 3

TI-2026-38652 FreeScout vulnerable to anonymous account takeover via /user-setup empty invite_hash on MySQL CVSS 3.1CRITICAL 9.4
TI-2026-22019 FreeScout's Predictable Authentication Token Enables Account Takeover CVSS 3.1CRITICAL 9.8
TI-2026-30304 FreeScout's user invitation hash never expires: permanent unauthenticated account takeover if invite link leaks CVSS 3.1CRITICAL 9.1
TI-2026-29249 FreeScout has Authentication Bypass and Information Disclosure in SystemController via /system/cron CVSS 4.0HIGH 8.9
TI-2026-29247 FreeScout has Predictable Attachment Token that Allows Unauthenticated Private File Download via Brute Force CVSS 4.0HIGH 8.8
TI-2026-38648 FreeScout Vulnerable to Unauthenticated Conversation Thread Injection via HMAC Length Bypass in FetchEmails CVSS 3.1HIGH 8.6

See all 90 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences