CVE-2026-57154 (GCVE-0-2026-57154)

Vulnerability from cvelistv5 – Published: 2026-11-03 18:10 – Updated: 2026-11-03 18:10
VLAI
Title
OPNsense: Configuration line injection via multiple GUI text fields
Summary
OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.11 and 26.4.1p1, authenticated Web UI or API users with delegated access to affected settings can submit CR or LF characters in fields expected to contain one line, causing generated privileged service configuration files to contain additional attacker-controlled directives or policy lines. The confirmed Dnsmasq path includes dhcp_boot.filename, dhcp_boot.servername, dhcp_boot.address, and dhcp_options.value, which are rendered into /usr/local/etc/dnsmasq.conf; access through page-services-dnsforwarder covers api/dnsmasq/*. Related affected fields span OpenVPN, DHCPv6, Unbound, IPsec, NTP, PPP or MPD, Monit, firewall, sudo, WebGUI, and System General configuration. Applying or restarting the affected service can alter behavior beyond the delegated setting, create service-side files, cross RBAC boundaries, or cause denial of service. Line injection through Monit mail password and adjacent Monit text fields into /usr/local/etc/monitrc demonstrated root command execution. Arbitrary shell command execution was not confirmed for the Dnsmasq path. This issue is fixed in versions 26.1.11 and 26.4.1p1.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
CWE
  • CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7904 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
opnsense core Affected: < 26.1.11
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "core",
          "vendor": "opnsense",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 26.1.11"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.11 and 26.4.1p1, authenticated Web UI or API users with delegated access to affected settings can submit CR or LF characters in fields expected to contain one line, causing generated privileged service configuration files to contain additional attacker-controlled directives or policy lines. The confirmed Dnsmasq path includes dhcp_boot.filename, dhcp_boot.servername, dhcp_boot.address, and dhcp_options.value, which are rendered into /usr/local/etc/dnsmasq.conf; access through page-services-dnsforwarder covers api/dnsmasq/*. Related affected fields span OpenVPN, DHCPv6, Unbound, IPsec, NTP, PPP or MPD, Monit, firewall, sudo, WebGUI, and System General configuration. Applying or restarting the affected service can alter behavior beyond the delegated setting, create service-side files, cross RBAC boundaries, or cause denial of service. Line injection through Monit mail password and adjacent Monit text fields into /usr/local/etc/monitrc demonstrated root command execution. Arbitrary shell command execution was not confirmed for the Dnsmasq path. This issue is fixed in versions 26.1.11 and 26.4.1p1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
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        {
          "descriptions": [
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              "description": "CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component (\u0027Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-93",
              "description": "CWE-93: Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-03T18:10:28.787Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/opnsense/core/security/advisories/GHSA-fq94-cxvc-9r7w",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/opnsense/core/security/advisories/GHSA-fq94-cxvc-9r7w"
        },
        {
          "name": "https://github.com/opnsense/core/commit/52b18e67a9ec4596a64ac3a53f3aa102ced55293",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/opnsense/core/commit/52b18e67a9ec4596a64ac3a53f3aa102ced55293"
        },
        {
          "name": "https://github.com/opnsense/core/commit/6c3be9a11699879fe50aea1c30e50de5864601d7",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/opnsense/core/commit/6c3be9a11699879fe50aea1c30e50de5864601d7"
        }
      ],
      "source": {
        "advisory": "GHSA-fq94-cxvc-9r7w",
        "discovery": "UNKNOWN"
      },
      "title": "OPNsense: Configuration line injection via multiple GUI text fields"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-57154",
    "datePublished": "2026-11-03T18:10:28.787Z",
    "dateReserved": "2026-06-24T01:45:48.698Z",
    "dateUpdated": "2026-11-03T18:10:28.787Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-57154",
      "date": "2026-11-04",
      "epss": "0.0046",
      "percentile": "0.40014"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "core",
                "vendor": "opnsense",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 26.1.11"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.11 and 26.4.1p1, authenticated Web UI or API users with delegated access to affected settings can submit CR or LF characters in fields expected to contain one line, causing generated privileged service configuration files to contain additional attacker-controlled directives or policy lines. The confirmed Dnsmasq path includes dhcp_boot.filename, dhcp_boot.servername, dhcp_boot.address, and dhcp_options.value, which are rendered into /usr/local/etc/dnsmasq.conf; access through page-services-dnsforwarder covers api/dnsmasq/*. Related affected fields span OpenVPN, DHCPv6, Unbound, IPsec, NTP, PPP or MPD, Monit, firewall, sudo, WebGUI, and System General configuration. Applying or restarting the affected service can alter behavior beyond the delegated setting, create service-side files, cross RBAC boundaries, or cause denial of service. Line injection through Monit mail password and adjacent Monit text fields into /usr/local/etc/monitrc demonstrated root command execution. Arbitrary shell command execution was not confirmed for the Dnsmasq path. This issue is fixed in versions 26.1.11 and 26.4.1p1."
          }
        ],
        "id": "CVE-2026-57154",
        "lastModified": "2026-11-03T19:18:06.513",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 5.2,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-11-03T19:18:06.513",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/opnsense/core/commit/52b18e67a9ec4596a64ac3a53f3aa102ced55293"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/opnsense/core/commit/6c3be9a11699879fe50aea1c30e50de5864601d7"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/opnsense/core/security/advisories/GHSA-fq94-cxvc-9r7w"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Received",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-74"
              },
              {
                "lang": "en",
                "value": "CWE-93"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



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