Path Traversal in Adguardteam Adguardhome
CVE-2026-41448
AdGuard Home, when started with the --glinet flag, contains an authentication bypass vulnerability that allows unauthenticated attackers to gain full admin access by supplying a path traversal sequence in the Admin-Token cookie, exploiting unsanitized string concatenation in the token file path construction within the authglinet middleware. Attackers can craft a request with a traversal payload in the Admin-Token header to redirect file reads to arbitrary paths.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.4 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L.
EPSS exploit prediction
EPSS: 0.008 (57.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.003
Affected products
- Adguardteam Adguardhome — versions 0
Weakness classification (CWE)
References
- github.com/AdguardTeam/AdGuardHome/releases/tag/v0.107.77 (release-notes)
- www.vulncheck.com/advisories/adguard-home-authentication-bypass-via-path-traver… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-41448?
- CVE-2026-41448 is a critical-severity vulnerability in Adguardteam Adguardhome, classified under Path Traversal. CVSS score: 9.4/10. Published 2026-06-08.
- How severe is CVE-2026-41448?
- Critical severity. CVSS v3 base score is 9.4 out of 10.