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Vulnerability record · CVE-2026-33406 · published 6 April 2026

CVE-2026-33406: Pi-hole web interface cross-site scripting vulnerability

Pi Hole · Web Interface

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, configuration values from the /api/config endpoint are placed directly into HTML value="" attributes without escaping in settings-advanced.js, enabling HTML attribute injection. A double quote in any config value breaks out of the attribute context. JavaScript execution is blocked by the server's CSP (script-src 'self'), but injected attributes can alter element styling for UI redressing. The primary attack vector is importing a malicious teleporter backup, which bypasses per-field server-side validation. This vulnerability is fixed in 6.5.

6.1 CVSS 3.1 Medium EPSS 0.37% · top 71.2% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score
0.37%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

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, configuration values from the /api/config endpoint are placed directly into HTML value="" attributes without escaping in settings-advanced.js, enabling HTML attribute injection. A double quote in any config value breaks out of the attribute context. JavaScript execution is blocked by the server's CSP (script-src 'self'), but injected attributes can alter element styling for UI redressing. The primary attack vector is importing a malicious teleporter backup, which bypasses per-field server-side validation. This vulnerability is fixed in 6.5.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/pi-hole/web/security/advisories/GHSA-9rfm-c5g6-538p ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.9CVE-2026-33765Pi-hole web interface os command injection vulnerabilityPi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker blocking application. Versions prior to 6.0 …EPSS 1.8%8.8CVE-2023-23614Pi-hole web interface insufficient session expiration vulnerabilityPi-hole®'s Web interface (based off of AdminLTE) provides a central location to manage your Pi-hole. Versions 4.0 and above, prior to 5.18.3 are vuln…EPSS 0.97%8.8CVE-2021-29448Pi-hole ftldns cross-site scripting vulnerabilityPi-hole is a Linux network-level advertisement and Internet tracker blocking application. The Stored XSS exists in the Pi-hole Admin portal, which ca…EPSS 0.67%8.2CVE-2025-59151Pi-hole web interface vulnerabilityPi-hole Admin Interface is a web interface for managing Pi-hole, a network-level advertisement and internet tracker blocking application. Pi-hole Adm…EPSS 0.44%7.5CVE-2021-3706Pi-hole web interface incorrect permission assignment vulnerabilityadminlte is vulnerable to Sensitive Cookie Without 'HttpOnly' FlagEPSS 1.1%6.1CVE-2026-33403Pi-hole web interface cross-site scripting vulnerabilityPi-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…EPSS 0.32%6.1CVE-2026-33404Pi-hole web interface cross-site scripting vulnerabilityPi-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…EPSS 0.25%6.1CVE-2021-3811Pi-hole web interface cross-site scripting vulnerabilityadminlte is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')EPSS 0.55%

Source: NIST National Vulnerability Database (record CVE-2026-33406), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.