CVE-2021-32793Public exploitNetwork attack vector

Stored XSS via unfiltered wildcard domains

Published Aug 4, 2021 · Updated Aug 3, 2024

Stored XSS in Pi-hole Web Interface before 5.5.1 allows remote authenticated users to execute script in an administrator's browser. The /admin/scripts/pi-hole/php/groups.php handler stores unfiltered wildcard-domain input, which is rendered on allowlist and blocklist pages. Exploitation requires administrative credentials to submit a token-bearing request and another administrator to view an affected domain page, exposing that browser session to client-side actions.

CVSS severity5.7
Medium
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Pi-hole Web Interface before 5.5.1 allows remote authenticated users to execute script in an administrator's browser. The /admin/scripts/pi-hole/php/groups.php handler stores unfiltered wildcard-domain input, which is rendered on allowlist and blocklist pages. Exploitation requires administrative credentials to submit a token-bearing request and another administrator to view an affected domain page, exposing that browser session to client-side actions.

The record

CVE
CVE-2021-32793
Published
Aug 4, 2021
Updated
Aug 3, 2024
Vendor
Pi-hole
Product
Pi-hole Web Interface
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 4, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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=< 5.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Pi-hole · Pi-hole Web Interfaceversion=< 5.5.1

Published CVSS scores

5.7GitHubCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:H

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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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