---
cve: "CVE-2026-33403"
severity: "MEDIUM"
cvss: 6.1
epss: "0.2%"
vendor: "pi-hole"
kev: false
exploited: false
published: "2026-04-06 15:17:10"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T21:29:39+02:00"
---

# CVE-2026-33403

> 6.1 MEDIUM · 🧪 PoC

## Beschreibung

Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker blocking application. From 6.0 to before 6.5, a reflected DOM-based XSS vulnerability in taillog.js allows an unauthenticated attacker to inject arbitrary HTML into the Pi-hole admin interface by crafting a malicious URL. The file query parameter is interpolated into an innerHTML assignment without escaping. Because the Content-Security-Policy is missing the form-action directive, injected  elements can exfiltrate credentials to an external origin. This vulnerability is fixed in 6.5.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Erforderlich | good |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 7a17e01c28eeb7af2c43384eccf5d859e3061371 (Commit)

## Referenzen

- <https://github.com/pi-hole/web/security/advisories/GHSA-7xqw-r9pr-qv59>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-33403) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_