CVE-2026-33406Public exploitNetwork attack vector

UI redressing via unescaped configuration attributes

Published Apr 6, 2026 · Updated Apr 6, 2026

HTML attribute injection in Pi-hole Web Interface 6.0 through 6.4.1 allows attackers to alter settings-page presentation via crafted values. In settings-advanced.js, values returned by /api/config are concatenated into value attributes without escapeHtml(), so a double quote terminates the original attribute and injects new ones. Exploitation requires an administrator to import a crafted Teleporter backup or set a malicious configuration value; CSP blocks inline scripts, bounding impact to UI redressing and form manipulation.

CVSS severity5.4
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTML attribute injection in Pi-hole Web Interface 6.0 through 6.4.1 allows attackers to alter settings-page presentation via crafted values. In settings-advanced.js, values returned by /api/config are concatenated into value attributes without escapeHtml(), so a double quote terminates the original attribute and injects new ones. Exploitation requires an administrator to import a crafted Teleporter backup or set a malicious configuration value; CSP blocks inline scripts, bounding impact to UI redressing and form manipulation.

The record

CVE
CVE-2026-33406
Published
Apr 6, 2026
Updated
Apr 6, 2026
Vendor
Pi-hole
Product
Pi-hole Web Interface
Classifications
T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 6.0, < 6.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Pi-hole · Pi-hole Web Interfaceversion=>= 6.0, < 6.5

Published CVSS scores

5.4GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1204.002Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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