---
id: 8531
title: "CVE-2026-78902: XSS to RCE in pfSense with one DNS request"
cve: CVE-2026-78902
source_domain: netspi.com
source_url: "https://www.netspi.com/blog/technical-blog/web-application-pentesting/cve-2026-78902-xss-to-rce-in-pfsense-with-one-dns-request/"
published_at: "2026-09-22T00:00:00Z"
tags: ["rce", "xss", "vulnerability-analysis", "exploit-chain", "firewall", "pfsense", "cve-2026-78902", "pfblockerng"]
phying_url: "https://phying.com/item/8531"
lang: en
---

# CVE-2026-78902: XSS to RCE in pfSense with one DNS request

## Summary

NetSPI reports CVE-2026-78902, a stored cross-site scripting issue in the pfSense pfBlockerNG package that can be escalated to remote code execution with a single DNS request.

## Intelligence Metadata

- **Sources:** netspi.com
- **CVE:** CVE-2026-78902
- **Published:** 2026-09-22T00:00:00Z
- **Original:** https://www.netspi.com/blog/technical-blog/web-application-pentesting/cve-2026-78902-xss-to-rce-in-pfsense-with-one-dns-request/
- **Phying News:** https://phying.com/item/8531