# CVE-2026-67189: pfSense Plus/CE Stored XSS via Traffic Graphs PTR Record

> Attackers can execute arbitrary JavaScript in admin browsers via unsanitized PTR records, leading to session hijacking and command execution.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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:** 19 Aug 2026
- **Updated:** 1 Oct 2026
- **Also known as:** GHSA-gfrq-49j2-vmv3

## What is CVE-2026-67189?

CVE-2026-67189 is a medium-severity cross-site scripting vulnerability in Netgate pfSense CE, published on 19 Aug 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

pfSense Plus before 26.07 and pfSense CE through 2.8.1 contain a stored cross-site scripting vulnerability in the Traffic Graphs top-talkers feature, where PTR records returned by reverse DNS lookups are incorporated without sanitization into AJAX responses and rendered as HTML through a DOM sink in the administrator interface. An attacker who controls a PTR record and generates sufficient traffic to appear as a top talker can execute arbitrary JavaScript in an administrator's browser, gaining access to the authenticated session context and same-origin access to the firewall management interface, enabling account creation and arbitrary OS command execution.

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

## Which versions are affected by CVE-2026-67189?


## How do I fix CVE-2026-67189?

No fix has been published for CVE-2026-67189 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-67189 being exploited?

There is no known exploitation of CVE-2026-67189 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-67189 and fix it if it is affected.

What it is: CVE-2026-67189 is a medium-severity cross-site scripting vulnerability in Netgate pfSense CE, published on 19 Aug 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: There is no known exploitation of CVE-2026-67189 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-2026-67189/ (Markdown: https://insights.sbomify.com/CVE-2026-67189/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-67189
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-67189
- OSV: https://osv.dev/vulnerability/CVE-2026-67189

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-67189/
Summaries are generated and may contain mistakes; the official description above is the record.