Vulnerability-Lookup

GHSA-M68J-M67P-C39J

Vulnerability from github – Published: 2026-10-30 12:31 – Updated: 2026-10-30 12:31

Details

OPNsense core before 26.7.8 contains a log injection vulnerability that allows unauthenticated attackers to plant victim IP addresses in the lockout_handler by submitting crafted WebGUI login usernames. Attackers can submit usernames like 'Invalid user ' repeatedly to add the victim to the sshlockout table, blocking SSH and WebGUI access and killing its pf states.

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-119423"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-117"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-30T12:16:39Z",
    "severity": "MODERATE"
  },
  "details": "OPNsense core before 26.7.8 contains a log injection vulnerability that allows unauthenticated attackers to plant victim IP addresses in the lockout_handler by submitting crafted WebGUI login usernames. Attackers can submit usernames like \u0027Invalid user \u003cvictim-ip\u003e\u0027 repeatedly to add the victim to the sshlockout table, blocking SSH and WebGUI access and killing its pf states.",
  "id": "GHSA-m68j-m67p-c39j",
  "modified": "2026-10-30T12:31:19Z",
  "published": "2026-10-30T12:31:19Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/opnsense/core/security/advisories/GHSA-2v2x-m4j7-76pv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119423"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opnsense/core/commit/14f8f7dd1d5f06522d60794a7beeac7adb9eca68"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opnsense/core/commit/2076f2c195bf9537ec220f0e5d6aff998f057410"
    },
    {
      "type": "WEB",
      "url": "https://abraxaslabs.tech/research/opnsense-lockout-factory-ip"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opnsense/core"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opnsense/core/blob/26.7.7/src/opnsense/mvc/app/library/OPNsense/Auth/AuthenticationFactory.php#L232"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opnsense/core/blob/26.7.7/src/opnsense/scripts/syslog/lockout_handler#L70"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/opnsense-core-before-26.7.8-lockout-ip-planting-via-webgui-login-username"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-119423 (GCVE-0-2026-119423)

Vulnerability from cvelistv5 – Published: 2026-10-30 11:30 – Updated: 2026-10-30 11:30

Title

OPNsense core before 26.7.8 Lockout IP Planting via WebGUI Login Username

Summary

OPNsense core before 26.7.8 contains a log injection vulnerability that allows unauthenticated attackers to plant victim IP addresses in the lockout_handler by submitting crafted WebGUI login usernames. Attackers can submit usernames like 'Invalid user <victim-ip>' repeatedly to add the victim to the sshlockout table, blocking SSH and WebGUI access and killing its pf states.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CWE

CWE-117 - Improper Output Neutralization for Logs

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7156 records in the last 180 days details

References

8 references

URL	Tags
https://github.com/opnsense/core/commit/14f8f7dd1…	patch
https://github.com/opnsense/core/commit/2076f2c19…	patch
https://github.com/opnsense/core/blob/26.7.7/src/…	technical-description
https://github.com/opnsense/core/blob/26.7.7/src/…	technical-description
https://github.com/opnsense/core/security/advisor…	vendor-advisory
https://abraxaslabs.tech/research/opnsense-lockou…	third-party-advisory
https://github.com/opnsense/core	product
https://www.vulncheck.com/advisories/opnsense-cor…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
opnsense	core	Affected: 0 , < 26.7.8 (semver) cpe:2.3:a:opnsense:opnsense::::::::

Date Public

2026-10-14 00:00

Credits

Abraxas Labs Ad Schellevis

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/opnsense/core",
          "product": "core",
          "repo": "https://github.com/opnsense/core",
          "vendor": "opnsense",
          "versions": [
            {
              "lessThan": "26.7.8",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:opnsense:opnsense:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "26.7.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Abraxas Labs"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Ad Schellevis"
        }
      ],
      "datePublic": "2026-10-14T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "OPNsense core before 26.7.8 contains a log injection vulnerability that allows unauthenticated attackers to plant victim IP addresses in the lockout_handler by submitting crafted WebGUI login usernames. Attackers can submit usernames like \u0027Invalid user \u003cvictim-ip\u003e\u0027 repeatedly to add the victim to the sshlockout table, blocking SSH and WebGUI access and killing its pf states."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-117",
              "description": "Improper Output Neutralization for Logs",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T11:30:53.650Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/opnsense/core/commit/14f8f7dd1d5f06522d60794a7beeac7adb9eca68"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/opnsense/core/commit/2076f2c195bf9537ec220f0e5d6aff998f057410"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/opnsense/core/blob/26.7.7/src/opnsense/mvc/app/library/OPNsense/Auth/AuthenticationFactory.php#L232"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/opnsense/core/blob/26.7.7/src/opnsense/scripts/syslog/lockout_handler#L70"
        },
        {
          "name": "GitHub Security Advisory (GHSA-2v2x-m4j7-76pv)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/opnsense/core/security/advisories/GHSA-2v2x-m4j7-76pv"
        },
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://abraxaslabs.tech/research/opnsense-lockout-factory-ip"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/opnsense/core"
        },
        {
          "name": "VulnCheck Advisory: OPNsense core before 26.7.8 Lockout IP Planting via WebGUI Login Username",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/opnsense-core-before-26.7.8-lockout-ip-planting-via-webgui-login-username"
        }
      ],
      "title": "OPNsense core before 26.7.8 Lockout IP Planting via WebGUI Login Username",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-119423",
    "datePublished": "2026-10-30T11:30:53.650Z",
    "dateReserved": "2026-10-30T02:41:13.241Z",
    "dateUpdated": "2026-10-30T11:30:53.650Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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