# CVE-2026-56127: pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via firewall_rules_edit.php

> Authenticated users can inject JavaScript into firewall rule descriptions, leading to XSS when viewed by other users in the firewall logs.

- **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-3c8g-23wp-3mx8

## What is CVE-2026-56127?

CVE-2026-56127 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: Rules: Edit privilege to inject arbitrary JavaScript via the descr parameter in /firewall_rules_edit.php. The firewall rule description is stored in the pfSense XML configuration with only backslash-escaping applied and no HTML sanitization, then rendered without encoding in the firewall log table in /status_logs_filter.php. The payload executes in the browser of any user with the Status: Logs: Firewall privilege who views the affected log entries.

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

## Which versions are affected by CVE-2026-56127?


## How do I fix CVE-2026-56127?

No fix has been published for CVE-2026-56127 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-56127 being exploited?

There is no known exploitation of CVE-2026-56127 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-56127 and fix it if it is affected.

What it is: CVE-2026-56127 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-2026-56127 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-2026-56127/ (Markdown: https://insights.sbomify.com/CVE-2026-56127/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-56127
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-56127
- OSV: https://osv.dev/vulnerability/CVE-2026-56127

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-56127/
Summaries are generated and may contain mistakes; the official description above is the record.