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CVE-2026-26952— Pi-hole Web Interface has Stored HTML Injection via Local DNS Records (CNAME/Hosts) in data-tag Attribute

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是Pi-hole公司的一款网络级广告拦截应用程序。 Pi-hole 6.4及之前版本存在安全漏洞，该漏洞源于本地DNS记录配置页面存在存储型HTML注入，可能导致任意HTML代码注入。

CVSS 5.4 · Medium EPSS 0.35% · P26
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I. Basic Information for CVE-2026-26952

Vulnerability Information
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Vulnerability Title
Pi-hole Web Interface has Stored HTML Injection via Local DNS Records (CNAME/Hosts) in data-tag Attribute
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. Versions 6.4 and below are vulnerable to stored HTML injection through the local DNS records configuration page, which allows an authenticated administrator to inject code that is stored in the Pi-hole configuration and rendered every time the DNS records table is viewed. The populateDataTable() function contains a data variable with the full DNS record value exactly as entered by the user and returned by the API. This value is inserted directly into the data-tag HTML attribute without any escaping or sanitization of special characters. When an attacker supplies a value containing double quotes ("), they can prematurely “close” the data-tag attribute and inject additional HTML attributes into the element. Since Pi-hole implements a Content Security Policy (CSP) that blocks inline JavaScript, the impact is limited. This issue has been fixed in version 6.4.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Pi-hole 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pi-hole是Pi-hole公司的一款网络级广告拦截应用程序。 Pi-hole 6.4及之前版本存在安全漏洞，该漏洞源于本地DNS记录配置页面存在存储型HTML注入，可能导致任意HTML代码注入。
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 < 6.4.1 -

II. Public POCs for CVE-2026-26952

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III. Intelligence Information for CVE-2026-26952

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Patches & Fixes for CVE-2026-26952 (1)

IV. Related Vulnerabilities

Same product: web
Same vendor: pi-hole
Same weakness: CWE-20

V. Comments for CVE-2026-26952

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