Stored HTML Injection in Pi-hole Admin Interface Affects Network-level Ad Blocker
CVE-2026-33405

3.1LOW

Key Information:

Vendor

Pi-hole

Status
Web
Vendor
CVE Published:
6 April 2026

What is CVE-2026-33405?

The Pi-hole Admin Interface, part of the Pi-hole project for network-level ad blocking, is susceptible to a stored HTML injection vulnerability. This issue arises due to improper handling of user input in the formatInfo() function located in queries.js. When a user expands a query row in the Query Log, data such as 'data.upstream', 'data.client.ip', and 'data.ede.text' is rendered directly into HTML without the necessary escaping. This oversight permits stored HTML payloads within the interface. Though JavaScript execution is restricted by the server's Content Security Policy, the improper rendering poses security risks, notably affecting user experience and system reliability. The vulnerability has been addressed in version 6.5 of the product.

Affected Version(s)

web >= 6.0, < 6.5

References

https://github.com/pi-hole/web/security/advisories/GHSA-j...
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CVSS V3.1

Score:
3.1
Severity:
LOW
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.