Critical
AdGuard Home Authentication Bypass via Path Traversal in Admin-Token Cookie
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-41448
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 04:26 UTC · Revision 1
Source evidence
AdGuard Home Authentication Bypass via Path Traversal in Admin-Token Cookie
core-osv · Original sourcePublished 8 Jun 2026, 16:12 UTC
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.
osv:CVE-2026-41448
Complete source record
{
"id": "3ab0a1c17aecd20d14f9d419abcfffa991a6b4240461773a1f8a207e78284716",
"url": "https://osv.dev/vulnerability/CVE-2026-41448",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "AdGuard Home Authentication Bypass via Path Traversal in Admin-Token Cookie",
"summary": "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.",
"evidence": "osv:CVE-2026-41448",
"products": [],
"severity": "critical",
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"aliases": [
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"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N"
}
],
"affected": [
{
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"type": "GIT",
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{
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41448.json"
}
}
],
"modified": "2026-10-28T02:30:25.921105906Z",
"provider": "osv",
"references": [
"https://github.com/AdguardTeam/AdGuardHome/releases/tag/v0.107.77",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41448.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-41448",
"https://www.vulncheck.com/advisories/adguard-home-authentication-bypass-via-path-traversal-in-admin-token-cookie",
"https://github.com/AdguardTeam/AdGuardHome"
],
"provider_metadata": {
"cwe_ids": [
"CWE-22"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41448.json"
}
},
"related_cves": [
{
"value": "CVE-2026-41448",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 492442,
"published_at": "2026-06-08T16:12:56.518+00:00"
}