Auth bypass in Pi-Hole Ftl
CVE-2026-35491
FTLDNS (pihole-FTL) provides an interactive API and also generates statistics for Pi-hole's Web interface. From 6.0 to before 6.6, Pi-hole FTL supports a CLI password feature (webserver.api.cli_pw) that creates “CLI” API sessions intended to be read-only for configuration changes. While /api/config correctly blocks CLI sessions from mutating configuration, /api/teleporter allowed Teleporter imports for CLI sessions, enabling a CLI-scoped session to overwrite configuration via a Teleporter archive (authorization bypass). This vulnerability is fixed in 6.6.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L.
EPSS exploit prediction
EPSS: 0.002 (6.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 6.4% 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: 0.002 · change: +0.000
Affected products
- Pi-Hole Ftl — versions >= 6.0, < 6.6
- Pi-Hole Ftldns
Weakness classification (CWE)
References
- github.com/pi-hole/FTL/security/advisories/GHSA-r7g8-3fj7-m5qq (Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-35491?
- CVE-2026-35491 is a medium-severity vulnerability in Pi-Hole Ftl, classified under Incorrect Authorization. CVSS score: 6.1/10. Published 2026-04-07.
- How severe is CVE-2026-35491?
- Medium severity. CVSS v3 base score is 6.1 out of 10.