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CVE-2026-33406— Pi-hole has a Stored HTML attribute injection

Quick assessment

Affected
pi-hole web
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Pi-Hole Adminlte是一个控制面板。用于统计更多数据。 Pi-Hole Adminlte 6.0至6.5之前版本存在跨站脚本漏洞，该漏洞源于配置值直接放入HTML属性未转义，可能导致HTML属性注入。

CVSS 5.4 · Medium EPSS 0.37% · P29
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I. Basic Information for CVE-2026-33406

Vulnerability Information
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Vulnerability Title
Pi-hole has a Stored HTML attribute injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Pi-Hole Adminlte 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pi-Hole Adminlte是一个控制面板。用于统计更多数据。 Pi-Hole Adminlte 6.0至6.5之前版本存在跨站脚本漏洞，该漏洞源于配置值直接放入HTML属性未转义，可能导致HTML属性注入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pi-hole web >= 6.0, < 6.5 -

II. Public POCs for CVE-2026-33406

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III. Intelligence Information for CVE-2026-33406

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Same Patch Batch · pi-hole · 2026-04-06 · 5 CVEs total

CVE-2026-33727 6.4 MEDIUM Pi-hole has a Local Privilege Escalation (post-compromise, pihole -> root).
CVE-2026-33403 6.1 MEDIUM Pi-hole has a Reflected XSS / HTML injection in taillog.js
CVE-2026-33404 3.4 LOW Pi-hole has a Stored XSS / HTML injection in the Network page/Dashboard
CVE-2026-33405 3.1 LOW Pi-hole has a Stored HTML Injection in queries.js

IV. Related Vulnerabilities

Same product: web
Same vendor: pi-hole
Same weakness: CWE-79

V. Comments for CVE-2026-33406

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