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CVE-2026-33403— Pi-hole has a Reflected XSS / HTML injection in taillog.js

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之前版本存在安全漏洞，该漏洞源于taillog.js存在反射型DOM跨站脚本，可能导致未经身份验证的攻击者注入任意HTML。

CVSS 6.1 · Medium EPSS 0.32% · P22
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I. Basic Information for CVE-2026-33403

Vulnerability Information
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Vulnerability Title
Pi-hole has a Reflected XSS / HTML injection in taillog.js
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, 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 <form> elements can exfiltrate credentials to an external origin. 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:C/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 安全漏洞
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之前版本存在安全漏洞，该漏洞源于taillog.js存在反射型DOM跨站脚本，可能导致未经身份验证的攻击者注入任意HTML。
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-2026-33403

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III. Intelligence Information for CVE-2026-33403

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Vendor Advisories for CVE-2026-33403 (1)

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-2026-33406 5.4 MEDIUM Pi-hole has a Stored HTML attribute injection
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-2026-33403

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