High
adminer — security advisory
Adminer before 5.4.3 contains a cookie injection vulnerability that allows attackers to manipulate cookie attributes by injecting arbitrary values through the unsanitized X-Forwarded-Prefix HTTP header used in Set-Cookie path attributes. Attackers can exploit a misconfigured reverse proxy to downgrade SameSite protection and enable cross-origin authenticated requests, bypassing cookie security controls.
- Products
- adminer
- Affected versions
- 4.2.1-1, 4.2.1-1ubuntu1, 4.2.1-1ubuntu1+esm1, 4.3.1-2, 4.5.0-1, 4.6.1-1, 4.6.2-1, 4.6.2-1ubuntu0.1~esm1, 4.7.2-1, 4.7.4-1, 4.7.5-1, 4.7.6-1, 4.7.6-1ubuntu0.1~esm1, 4.7.9-2, 4.8.1-1, 4.8.1-1ubuntu1, 4.8.1-2, 5.2.1+dfsg-1, 5.3.0+dfsg-1, 5.4.0+dfsg-1, 5.4.1+dfsg-1, 5.4.2+dfsg-1, 5.4.4+dfsg-1, 6.0.0-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-63771
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:12 UTC · Revision 1
Source evidence
Adminer before 5.4.3 contains a cookie injection vulnerability that allows attackers to manipulate cookie attributes by injecting arbitrary values through the unsanitized X-Forwarded-Prefix HTTP header used in Set-Cookie path attributes. Attackers can exploit a misconfigured reverse proxy to downgrade SameSite protection and enable cross-origin authenticated requests, bypassing cookie security controls.
osv:UBUNTU-CVE-2026-63771
adminer
Fixed versions: Not specified
adminer
Fixed versions: Not specified
adminer
Fixed versions: Not specified
adminer
Fixed versions: Not specified
adminer
Fixed versions: Not specified
adminer
Fixed versions: Not specified
adminer
Fixed versions: Not specified
Complete source record
{
"id": "da2fe75505ae65c9fa755bac174c16cdad258b81930080efc9ff291a7d2224d6",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-63771",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-63771",
"summary": "Adminer before 5.4.3 contains a cookie injection vulnerability that allows attackers to manipulate cookie attributes by injecting arbitrary values through the unsanitized X-Forwarded-Prefix HTTP header used in Set-Cookie path attributes. Attackers can exploit a misconfigured reverse proxy to downgrade SameSite protection and enable cross-origin authenticated requests, bypassing cookie security controls.",
"evidence": "osv:UBUNTU-CVE-2026-63771",
"products": [
{
"name": {
"value": "adminer",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.2.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.2.1-1ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "4.2.1-1ubuntu1+esm1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "adminer",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.3.1-2",
"evidence": "/affected/1/versions"
},
{
"value": "4.5.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.6.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.6.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.6.2-1ubuntu0.1~esm1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "adminer",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.7.2-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.7.4-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.7.5-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.7.6-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.7.6-1ubuntu0.1~esm1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "adminer",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.7.9-2",
"evidence": "/affected/3/versions"
},
{
"value": "4.8.1-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "adminer",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.8.1-1",
"evidence": "/affected/4/versions"
},
{
"value": "4.8.1-1ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "4.8.1-2",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "adminer",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.4.1+dfsg-1",
"evidence": "/affected/5/versions"
},
{
"value": "5.4.2+dfsg-1",
"evidence": "/affected/5/versions"
},
{
"value": "5.4.4+dfsg-1",
"evidence": "/affected/5/versions"
},
{
"value": "6.0.0-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "adminer",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.2.1+dfsg-1",
"evidence": "/affected/6/versions"
},
{
"value": "5.3.0+dfsg-1",
"evidence": "/affected/6/versions"
},
{
"value": "5.4.0+dfsg-1",
"evidence": "/affected/6/versions"
},
{
"value": "5.4.1+dfsg-1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-63771",
"aliases": [
"UBUNTU-CVE-2026-63771"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "adminer",
"purl": "pkg:deb/ubuntu/adminer?arch=source&distro=esm-apps%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"4.2.1-1",
"4.2.1-1ubuntu1",
"4.2.1-1ubuntu1+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63771.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "adminer",
"binary_version": "4.2.1-1ubuntu1+esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "adminer",
"purl": "pkg:deb/ubuntu/adminer?arch=source&distro=esm-apps%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"4.3.1-2",
"4.5.0-1",
"4.6.1-1",
"4.6.2-1",
"4.6.2-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63771.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "adminer",
"binary_version": "4.6.2-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "adminer",
"purl": "pkg:deb/ubuntu/adminer?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"4.7.2-1",
"4.7.4-1",
"4.7.5-1",
"4.7.6-1",
"4.7.6-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63771.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "adminer",
"binary_version": "4.7.6-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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],
"package": {
"name": "adminer",
"purl": "pkg:deb/ubuntu/adminer?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"4.7.9-2",
"4.8.1-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63771.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "adminer",
"binary_version": "4.8.1-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
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}
],
"package": {
"name": "adminer",
"purl": "pkg:deb/ubuntu/adminer?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"4.8.1-1",
"4.8.1-1ubuntu1",
"4.8.1-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63771.json"
},
"ecosystem_specific": {
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{
"binary_name": "adminer",
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}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
"introduced": "0"
}
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}
],
"package": {
"name": "adminer",
"purl": "pkg:deb/ubuntu/adminer?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"5.4.1+dfsg-1",
"5.4.2+dfsg-1",
"5.4.4+dfsg-1",
"6.0.0-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63771.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "adminer",
"binary_version": "6.0.0-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "adminer",
"purl": "pkg:deb/ubuntu/adminer?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"5.2.1+dfsg-1",
"5.3.0+dfsg-1",
"5.4.0+dfsg-1",
"5.4.1+dfsg-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63771.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "adminer",
"binary_version": "5.4.1+dfsg-1"
}
]
}
}
],
"modified": "2026-10-17T13:00:32.619332129Z",
"provider": "osv",
"upstream": [
"CVE-2026-63771"
],
"references": [
"https://ubuntu.com/security/CVE-2026-63771",
"https://www.cve.org/CVERecord?id=CVE-2026-63771",
"https://github.com/vrana/adminer/issues/1298",
"https://github.com/vrana/adminer/security/advisories/GHSA-c533-9qwm-8w5h"
]
},
"related_cves": [
{
"value": "CVE-2026-63771",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360689,
"published_at": "2026-07-20T19:17:00+00:00"
}