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DEBIAN-CVE-2026-100698

Type: advisorySource: OSV1 source record

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.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-100698

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-100698

adminer

Source reference: /affected/0/package/name

Affected versions
5.2.1+dfsg-1

Source reference: /affected/0/versions

5.3.0+dfsg-1

Source reference: /affected/0/versions

5.4.0+dfsg-1

Source reference: /affected/0/versions

5.4.1+dfsg-1

Source reference: /affected/0/versions

5.4.2+dfsg-1

Source reference: /affected/0/versions

5.4.3+dfsg-1

Source reference: /affected/0/versions

5.4.4+dfsg-1

Source reference: /affected/0/versions

6.0.0-1

Source reference: /affected/0/versions

6.0.1-1

Source reference: /affected/0/versions

Fixed versions
6.0.2-1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "6.0.2-1"
          }
        ]
      }
    ],
    "package": {
      "name": "adminer",
      "purl": "pkg:deb/debian/adminer?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "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",
      "5.4.3+dfsg-1",
      "5.4.4+dfsg-1",
      "6.0.0-1",
      "6.0.1-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-100698.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#59467 · Revision 1
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Publisher date
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