CVE-2026-33406

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 v3 5.4 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/pi-hole/web/security/advisories/GHSA-9rfm-c5g6-538p	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:pi-hole:web_interface:*:*:*:*:*:*:*:*

History

14 Apr 2026, 02:04

Type	Values Removed	Values Added
First Time		Pi-hole Pi-hole web Interface
References	~~() https://github.com/pi-hole/web/security/advisories/GHSA-9rfm-c5g6-538p -~~	() https://github.com/pi-hole/web/security/advisories/GHSA-9rfm-c5g6-538p - Exploit, Vendor Advisory
CPE		cpe:2.3:a:pi-hole:web_interface::::::::

06 Apr 2026, 15:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-06 15:17

Updated : 2026-04-14 02:04

NVD link : CVE-2026-33406

Mitre link : CVE-2026-33406

CVE.ORG link : CVE-2026-33406

JSON object : View

Products Affected

pi-hole

web_interface

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

{"id": "CVE-2026-33406", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.4, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.5, "exploitabilityScore": 2.8}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 2.8}]}, "published": "2026-04-06T15:17:10.627", "references": [{"url": "https://github.com/pi-hole/web/security/advisories/GHSA-9rfm-c5g6-538p", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-79"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-04-14T02:04:17.300", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:pi-hole:web_interface:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3F1EA9FF-4B56-41DE-A685-A1B75E6ECEF2", "versionEndIncluding": "6.4.1", "versionStartIncluding": "6.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}