# CVE-2026-56128: pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via firewall_schedule_edit.php

> Authenticated users can inject JavaScript into firewall schedules, leading to XSS attacks against other administrators viewing the rules list.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 3 Sep 2026
- **Updated:** 1 Oct 2026
- **Also known as:** GHSA-xqh2-9r6g-5jrx

## What is CVE-2026-56128?

CVE-2026-56128 is a medium-severity cross-site scripting vulnerability in Netgate pfSense CE, published on 3 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

pfSense Plus before 26.07 and CE before 2.9.0 allow authenticated users with the Firewall: Schedules: Edit privilege to inject arbitrary JavaScript via the descr parameter in /firewall_schedule_edit.php. The schedule description is stored without HTML sanitization and subsequently inserted into an HTML attribute value in /firewall_rules.php with only single-quote escaping applied, permitting double-quote breakout. The payload executes in the browser of any user with the Firewall: Rules privilege who views the rules list with the affected schedule attached.

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

## Which versions are affected by CVE-2026-56128?


## How do I fix CVE-2026-56128?

No fix has been published for CVE-2026-56128 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-56128 being exploited?

There is no known exploitation of CVE-2026-56128 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-56128 and fix it if it is affected.

What it is: CVE-2026-56128 is a medium-severity cross-site scripting vulnerability in Netgate pfSense CE, published on 3 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-56128 in the wild and no public exploit code.

Affected product: Netgate pfSense CE. 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-2026-56128/ (Markdown: https://insights.sbomify.com/CVE-2026-56128/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-56128
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-56128
- OSV: https://osv.dev/vulnerability/CVE-2026-56128

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-56128/
Summaries are generated and may contain mistakes; the official description above is the record.