CVE-2021-29448: Stored DOM XSS in Pi-hole Admin Web Interface

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-04-15 · updated 2026-06-17
Weakness: CWE-79

Description

Pi-hole is a Linux network-level advertisement and Internet tracker blocking application. The Stored XSS exists in the Pi-hole Admin portal, which can be exploited by the malicious actor with the network access to DNS server. See the referenced GitHub security advisory for patch details.

Affected products

pi-hole FTL: 5.7
pi-hole: 5.2.4
pi-hole web: before 5.5 — fixed in 5.5

How to fix

Upgrade to a fixed version: pi-hole web 5.5. Check the vendor advisory for mitigations.

References

https://github.com/pi-hole/AdminLTE/security/advisories/GHSA-cwwf-93p7-73j9
https://github.com/pi-hole/AdminLTE/security/advisories/GHSA-cwwf-93p7-73j9

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