adminer — security advisory
Adminer 5.5.1 through 6.0.1 improperly parses the login 'server' string in the host_port() function in adminer/include/functions.inc.php. The port capture group requires pure digits anchored to the end of the string, so any server value with a non-digit tail fails the regex and falls back to returning the whole string as the host with an empty port. Because the privileged-port restriction in adminer/include/auth.inc.php inspects only the parsed port, the check is skipped, and the mysqli/mysqlnd client subsequently re-parses host:port from the host string and opens a TCP connection. A remote, unauthenticated attacker who can reach the Adminer login page can submit a crafted value such as 127.0.0.1:80/x to make the server initiate TCP connections to arbitrary internal hosts and privileged ports before credentials are validated, enabling server-side request forgery and blind internal port scanning (connection refused vs. handshake vs. timeout acts as a liveness oracle). This is a regression that re-opens the bypass fixed in 5.5.0 (GHSA-58cq-mgw2-38m5). Fixed in 6.0.2.
- 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-2026-100698
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:53 UTC · Revision 1
Source evidence
Adminer 5.5.1 through 6.0.1 improperly parses the login 'server' string in the host_port() function in adminer/include/functions.inc.php. The port capture group requires pure digits anchored to the end of the string, so any server value with a non-digit tail fails the regex and falls back to returning the whole string as the host with an empty port. Because the privileged-port restriction in adminer/include/auth.inc.php inspects only the parsed port, the check is skipped, and the mysqli/mysqlnd client subsequently re-parses host:port from the host string and opens a TCP connection. A remote, unauthenticated attacker who can reach the Adminer login page can submit a crafted value such as 127.0.0.1:80/x to make the server initiate TCP connections to arbitrary internal hosts and privileged ports before credentials are validated, enabling server-side request forgery and blind internal port scanning (connection refused vs. handshake vs. timeout acts as a liveness oracle). This is a regression that re-opens the bypass fixed in 5.5.0 (GHSA-58cq-mgw2-38m5). Fixed in 6.0.2.
osv:UBUNTU-CVE-2026-100698
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": "5524a7b6e83a28c0476b4a3e018d8a93f7ae76a6eb05019e4cbd5119b94a6655",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-100698",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-100698",
"summary": "Adminer 5.5.1 through 6.0.1 improperly parses the login 'server' string in the host_port() function in adminer/include/functions.inc.php. The port capture group requires pure digits anchored to the end of the string, so any server value with a non-digit tail fails the regex and falls back to returning the whole string as the host with an empty port. Because the privileged-port restriction in adminer/include/auth.inc.php inspects only the parsed port, the check is skipped, and the mysqli/mysqlnd client subsequently re-parses host:port from the host string and opens a TCP connection. A remote, unauthenticated attacker who can reach the Adminer login page can submit a crafted value such as 127.0.0.1:80/x to make the server initiate TCP connections to arbitrary internal hosts and privileged ports before credentials are validated, enabling server-side request forgery and blind internal port scanning (connection refused vs. handshake vs. timeout acts as a liveness oracle). This is a regression that re-opens the bypass fixed in 5.5.0 (GHSA-58cq-mgw2-38m5). Fixed in 6.0.2.",
"evidence": "osv:UBUNTU-CVE-2026-100698",
"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"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
},
{
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"evidence": "/affected/1/versions"
},
{
"value": "4.6.2-1ubuntu0.1~esm1",
"evidence": "/affected/1/versions"
}
]
},
{
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"affected_versions": [
{
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"evidence": "/affected/2/versions"
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{
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{
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{
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"evidence": "/affected/2/versions"
},
{
"value": "4.7.6-1ubuntu0.1~esm1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
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"evidence": "/affected/3/package/name"
},
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"affected_versions": [
{
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"evidence": "/affected/3/versions"
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{
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{
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{
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"evidence": "/affected/4/versions"
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{
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{
"name": {
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"evidence": "/affected/5/package/name"
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"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"
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{
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"evidence": "/affected/6/versions"
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]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-100698",
"aliases": [
"UBUNTU-CVE-2026-100698"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/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-2026-100698.json"
},
"ecosystem_specific": {
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"binary_version": "4.2.1-1ubuntu1+esm1"
}
]
}
},
{
"ranges": [
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],
"package": {
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"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
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"4.5.0-1",
"4.6.1-1",
"4.6.2-1",
"4.6.2-1ubuntu0.1~esm1"
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"database_specific": {
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},
"ecosystem_specific": {
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{
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"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
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"4.7.4-1",
"4.7.5-1",
"4.7.6-1",
"4.7.6-1ubuntu0.1~esm1"
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"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
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"4.8.1-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-100698.json"
},
"ecosystem_specific": {
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{
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"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
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"5.3.0+dfsg-1",
"5.4.0+dfsg-1",
"5.4.1+dfsg-1"
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},
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],
"modified": "2026-10-17T12:59:43.049694978Z",
"provider": "osv",
"upstream": [
"CVE-2026-100698"
],
"references": [
"https://ubuntu.com/security/CVE-2026-100698",
"https://www.cve.org/CVERecord?id=CVE-2026-100698",
"https://github.com/vrana/adminer/security/advisories/GHSA-rwxg-xph9-82cj",
"https://www.vulncheck.com/advisories/adminer-before-6.0.2-privileged-port-ssrf-via-host-port-regex"
]
},
"related_cves": [
{
"value": "CVE-2026-100698",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 359726,
"published_at": "2026-09-26T14:16:00+00:00"
}