by Kastro
Paper/Archive/CVE-2026-41448

CVE-2026-41448

AdguardTeam AdGuardHome — AdGuard Home Authentication Bypass via Path Traversal in Admin-Token Cookie

EPSS 0.5%CVSS 9.4
critical.is priorityof 100
37
CVSS 9.4 (CNA)9.4 / 10 × 3028.2Not in CISA KEV+300.0EPSS percentile 45.6.456 × 209.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
AdGuardHome< 0.107.770.107.77CNA

Scores by source

VulnCheck (CNA)9.4CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
VulnCheck (CNA)9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgithub.com/AdguardTeam/AdGuardHome/releases/tag/v0.107.77writeupvulncheck.com/advisories/adguard-home-authentication-bypass-via-path-traversal-in-admin-token-cookie