CVE-2026-26953Public exploitNetwork attack vector

Stored HTML injection via unescaped forwarded address

Published Feb 19, 2026 · Updated Feb 19, 2026

Stored HTML injection in Pi-hole Web Interface before 6.4.1 allows remote authenticated users to alter the active sessions page. scripts/js/settings-api.js passes data.x_forwarded_for from stored session metadata directly into jQuery .html() inside rowCallback, bypassing DataTables text escaping and causing the browser to parse attacker-supplied tags. Valid Pi-hole credentials and a later administrator visit to the API settings page are required; the default CSP blocks inline script, limiting the grounded impact to rendered HTML such as UI spoofing or hidden session rows.

CVSS severity5.4
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored HTML injection in Pi-hole Web Interface before 6.4.1 allows remote authenticated users to alter the active sessions page. scripts/js/settings-api.js passes data.x_forwarded_for from stored session metadata directly into jQuery .html() inside rowCallback, bypassing DataTables text escaping and causing the browser to parse attacker-supplied tags. Valid Pi-hole credentials and a later administrator visit to the API settings page are required; the default CSP blocks inline script, limiting the grounded impact to rendered HTML such as UI spoofing or hidden session rows.

The record

CVE
CVE-2026-26953
Published
Feb 19, 2026
Updated
Feb 19, 2026
Vendor
Pi-hole
Product
Pi-hole Web Interface
Classifications
CWE-116, CWE-20, CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 19, 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=< 6.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Pi-hole · Pi-hole Web Interfaceversion=< 6.4.1

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
CWE-20Improper Input Validation
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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