What is CVE-2026-33406?

CVE-2026-33406 is a medium-severity vulnerability in Pi-hole Web, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-04-06.

How severe is CVE-2026-33406?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Pi-hole Web

CVE-2026-33406

Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker blocking application. From 6.0 to before 6.5, configuration values from the /api/config endpoint are placed directly into HTML value="…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (14.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

Affected products

Pi-hole Web — versions >= 6.0, < 6.5

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

https://github.com/pi-hole/web/security/advisories/GHSA-9rfm-c5g6-538p (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-33406?: CVE-2026-33406 is a medium-severity vulnerability in Pi-hole Web, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-04-06.
How severe is CVE-2026-33406?: Medium severity. CVSS v3 base score is 5.4 out of 10.