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

> Attackers can inject malicious HTML into admin alert emails via spoofed headers, potentially executing code or stealing sessions when admins view the email.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 8 Oct 2026
- **Updated:** 14 Oct 2026
- **Also known as:** GHSA-9cm3-qvj2-8hg4

## What is CVE-2026-107393?

CVE-2026-107393 is a medium-severity cross-site scripting vulnerability in freescout-help-desk freescout, published on 8 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation), CWE-116 (Improper Encoding or Escaping of Output)

## Which versions are affected by CVE-2026-107393?


## How do I fix CVE-2026-107393?

No fix has been published for CVE-2026-107393 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-107393 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-107393 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-107393 and fix it if it is affected.

What it is: CVE-2026-107393 is a medium-severity cross-site scripting vulnerability in freescout-help-desk freescout, published on 8 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-107393 exists.

Affected product: freescout-help-desk freescout. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-107393/ (Markdown: https://insights.sbomify.com/CVE-2026-107393/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-107393
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-107393
- OSV: https://osv.dev/vulnerability/CVE-2026-107393

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-107393/
Summaries are generated and may contain mistakes; the official description above is the record.