# CVE-2026-13374: WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in ConnectWise Technology Integration Configuration

> Attackers can inject malicious scripts into the ConnectWise integration configuration, potentially compromising administrator sessions on WatchGuard Firebox devices.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 2 Jul 2026
- **Updated:** 27 Aug 2026
- **Also known as:** GHSA-vjhv-mh94-cxp5

## What is CVE-2026-13374?

CVE-2026-13374 is a medium-severity cross-site scripting vulnerability in Watchguard Fireware, published on 2 Jul 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS (ConnectWise Technology Integration module) allows Stored XSS. This vulnerability is an additional unmitigated attack path for CVE-2025-13937.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-13374?

It affects 1 product.


Products: Watchguard Fireware.

## How do I fix CVE-2026-13374?

No fix has been published for CVE-2026-13374 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-13374 being exploited?

There is no known exploitation of CVE-2026-13374 in the wild and no public exploit code.

## Other vulnerabilities in Watchguard Fireware

- [CVE-2022-26318](https://insights.sbomify.com/CVE-2022-26318/): WatchGuard Firebox and XTM Appliances Arbitrary Code Execution (critical 9.8, exploited in the wild)
- [CVE-2025-14733](https://insights.sbomify.com/CVE-2025-14733/): WatchGuard Firebox Out of Bounds Write (critical 9.3, exploited in the wild)
- [CVE-2025-9242](https://insights.sbomify.com/CVE-2025-9242/): WatchGuard Firebox Out-of-Bounds Write (critical 9.3, exploited in the wild)
- [CVE-2022-23176](https://insights.sbomify.com/CVE-2022-23176/): WatchGuard Firebox and XTM Privilege Escalation (high 8.8, exploited in the wild)
- [CVE-2022-31789](https://insights.sbomify.com/CVE-2022-31789/): Integer overflow in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-13374 and fix it if it is affected.

What it is: CVE-2026-13374 is a medium-severity cross-site scripting vulnerability in Watchguard Fireware, published on 2 Jul 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-13374 in the wild and no public exploit code.

Affected product: Watchguard Fireware. 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-2026-13374/ (Markdown: https://insights.sbomify.com/CVE-2026-13374/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-13374
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13374
- OSV: https://osv.dev/vulnerability/CVE-2026-13374

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-13374/
Summaries are generated and may contain mistakes; the official description above is the record.