UBUNTU-CVE-2026-48554 (CVE-2026-48554)

Vulnerability from osv_ubuntu – Published: 2026-08-12 17:17 – Updated: 2026-08-19 11:05 – Source website
VLAI
Details

Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to authenticated remote code execution via unfiltered NOTIFICATION-family macro substitution through the com_data parameter. When a notification command references $NOTIFICATIONCOMMENT$ or $NOTIFICATIONAUTHOR$ in a shell-reachable position, authenticated UI users can run arbitrary commands as the nagios user. Exploitation requires a non-default configuration in which a notification command references these macros in a shell-executed command line.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.7 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nagios4",
            "binary_version": "4.3.4-3ubuntu0.1"
          },
          {
            "binary_name": "nagios4-cgi",
            "binary_version": "4.3.4-3ubuntu0.1"
          },
          {
            "binary_name": "nagios4-common",
            "binary_version": "4.3.4-3ubuntu0.1"
          },
          {
            "binary_name": "nagios4-core",
            "binary_version": "4.3.4-3ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "nagios4",
        "purl": "pkg:deb/ubuntu/nagios4@4.3.4-3ubuntu0.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.3.4-3",
        "4.3.4-3ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nagios4",
            "binary_version": "4.4.6-4ubuntu0.22.04.1"
          },
          {
            "binary_name": "nagios4-cgi",
            "binary_version": "4.4.6-4ubuntu0.22.04.1"
          },
          {
            "binary_name": "nagios4-common",
            "binary_version": "4.4.6-4ubuntu0.22.04.1"
          },
          {
            "binary_name": "nagios4-core",
            "binary_version": "4.4.6-4ubuntu0.22.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "nagios4",
        "purl": "pkg:deb/ubuntu/nagios4@4.4.6-4ubuntu0.22.04.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.4.6-4",
        "4.4.6-4ubuntu0.22.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nagios4",
            "binary_version": "4.4.6-4ubuntu0.24.04.1"
          },
          {
            "binary_name": "nagios4-cgi",
            "binary_version": "4.4.6-4ubuntu0.24.04.1"
          },
          {
            "binary_name": "nagios4-common",
            "binary_version": "4.4.6-4ubuntu0.24.04.1"
          },
          {
            "binary_name": "nagios4-core",
            "binary_version": "4.4.6-4ubuntu0.24.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "nagios4",
        "purl": "pkg:deb/ubuntu/nagios4@4.4.6-4ubuntu0.24.04.1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.4.6-4",
        "4.4.6-4ubuntu0.24.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nagios4",
            "binary_version": "4.4.6-4.1ubuntu2"
          },
          {
            "binary_name": "nagios4-cgi",
            "binary_version": "4.4.6-4.1ubuntu2"
          },
          {
            "binary_name": "nagios4-common",
            "binary_version": "4.4.6-4.1ubuntu2"
          },
          {
            "binary_name": "nagios4-core",
            "binary_version": "4.4.6-4.1ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "nagios4",
        "purl": "pkg:deb/ubuntu/nagios4@4.4.6-4.1ubuntu2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.4.6-4.1ubuntu1",
        "4.4.6-4.1ubuntu2"
      ]
    }
  ],
  "aliases": [],
  "details": "Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to authenticated remote code execution via unfiltered NOTIFICATION-family macro substitution through the com_data parameter. When a notification command references $NOTIFICATIONCOMMENT$ or $NOTIFICATIONAUTHOR$ in a shell-reachable position, authenticated UI users can run arbitrary commands as the nagios user. Exploitation requires a non-default configuration in which a notification command references these macros in a shell-executed command line.",
  "id": "UBUNTU-CVE-2026-48554",
  "modified": "2026-08-19T11:05:27Z",
  "published": "2026-08-12T17:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-48554"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-48554"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog"
    },
    {
      "type": "REPORT",
      "url": "https://www.nagios.com/security-disclosures/nagios-core/"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/nagios-core-xi-authenticated-rce-via-unfiltered-notification-family-macro-substitution"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-48554"
  ]
}



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