XSS in Pi-Hole Web
CVE-2026-33405
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, the formatInfo() function in queries.js renders data.upstream, data.client.ip, and data.ede.text into HTML without escaping when a user expands a query row in the Query Log, enabling stored HTML injection. JavaScript execution is blocked by the server's CSP (script-src 'self'). The same fields are properly escaped in the table view (rowCallback), confirming the omission was an oversight. This vulnerability is fixed in 6.5.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (20.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Pi-Hole Web — versions >= 6.0, < 6.5
- Pi-Hole Web Interface
Weakness classification (CWE)
References
- github.com/pi-hole/web/security/advisories/GHSA-jx8x-mj2r-62vq (Third Party Advisory)
Frequently asked questions
- What is CVE-2026-33405?
- CVE-2026-33405 is a low-severity vulnerability in Pi-Hole Web, classified under Cross-site Scripting. CVSS score: 3.1/10. Published 2026-04-06.
- How severe is CVE-2026-33405?
- Low severity. CVSS v3 base score is 3.1 out of 10.