Vulnerability-Lookup

CVE-2026-4266 (GCVE-0-2026-4266)

Vulnerability from cvelistv5 – Published: 2026-03-30 12:38 – Updated: 2026-03-31 03:55

Title

WatchGuard Firebox Insecure Deserialization in Fireware Access Portal

Summary

An Insecure Deserialization vulnerability in WatchGuard Fireware OS allows an attacker that has obtained write access to the local filesystem through another vulnerability to execute arbitrary code in the context of the portald user.This issue affects Fireware OS: 12.1 through 12.11.8 and 2025.1 through 2026.1.2. Note, this vulnerability does not affect Firebox platforms that do not support the Access Portal feature, including the T-15 and T-35.

Severity ?

8.4 (High)


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

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

WatchGuard

References

URL

Tags

https://www.watchguard.com/wgrd-psirt/advisory/wg…

vendor-advisory

Impacted products

	Vendor	Product	Version
	WatchGuard	Fireware OS	Affected: 12.1 , ≤ 12.11.8 (semver) Affected: 2025.1 , ≤ 2026.1.2 (semver)

Credits

btaol

Show details on NVD website

JSON

To clipboard

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GHSA-MMHR-MFJP-VV8J

Vulnerability from github – Published: 2026-03-30 15:32 – Updated: 2026-03-30 15:32

Details

Note, this vulnerability does not affect Firebox platforms that do not support the Access Portal feature, including the T-15 and T-35.

Severity ?

8.4 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-4266"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-30T13:16:22Z",
    "severity": "HIGH"
  },
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  "id": "GHSA-mmhr-mfjp-vv8j",
  "modified": "2026-03-30T15:32:05Z",
  "published": "2026-03-30T15:32:05Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4266"
    },
    {
      "type": "WEB",
      "url": "https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00007"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
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      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/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"
    }
  ]
}

FKIE_CVE-2026-4266

Vulnerability from fkie_nvd - Published: 2026-03-30 13:16 - Updated: 2026-03-30 13:26

Severity ?

8.4 (High) - CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	5d1c2695-1a31-4499-88ae-e847036fd7e3	https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00007

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An Insecure Deserialization vulnerability in WatchGuard Fireware OS allows an attacker that has obtained write access to the local filesystem through another vulnerability to execute arbitrary code in the context of the portald user.This issue affects Fireware OS: 12.1 through 12.11.8 and 2025.1 through 2026.1.2.\n\nNote, this vulnerability does not affect Firebox platforms that do not support the Access Portal feature, including the T-15 and T-35."
    }
  ],
  "id": "CVE-2026-4266",
  "lastModified": "2026-03-30T13:26:07.647",
  "metrics": {
    "cvssMetricV40": [
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          "baseScore": 8.4,
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          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
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          "privilegesRequired": "HIGH",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
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        "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3",
        "type": "Secondary"
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  "published": "2026-03-30T13:16:22.573",
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  "vulnStatus": "Awaiting Analysis",
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      "type": "Secondary"
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  ]
}

WID-SEC-W-2026-0892

Vulnerability from csaf_certbund - Published: 2026-03-26 23:00 - Updated: 2026-03-30 22:00

Summary

WatchGuard Firebox: Mehrere Schwachstellen

Severity

Mittel

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: WatchGuard Firebox ist ein Firewall bzw. Unified Threat Management Produkt.

Angriff: Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in WatchGuard Firebox ausnutzen, um beliebigen Programmcode auszuführen oder einen Denial of Service zu verursachen.

Betroffene Betriebssysteme: - Appliance

CVE-2026-4266

CVE-2026-4315

References

URL

Category

	https://wid.cert-bund.de/.well-known/csaf/white/2…	self
	https://wid.cert-bund.de/portal/wid/securityadvis…	self
	https://www.watchguard.com/wgrd-psirt/advisory/wg…	external
	https://www.watchguard.com/wgrd-psirt/advisory/wg…	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "mittel"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "WatchGuard Firebox ist ein Firewall bzw. Unified Threat Management Produkt.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in WatchGuard Firebox ausnutzen, um beliebigen Programmcode auszuf\u00fchren oder einen Denial of Service zu verursachen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Appliance",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-0892 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0892.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-0892 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0892"
      },
      {
        "category": "external",
        "summary": "Watchguard Security Advisory vom 2026-03-26",
        "url": "https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00006"
      },
      {
        "category": "external",
        "summary": "Watchguard Security Advisory vom 2026-03-26",
        "url": "https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00007"
      }
    ],
    "source_lang": "en-US",
    "title": "WatchGuard Firebox: Mehrere Schwachstellen",
    "tracking": {
      "current_release_date": "2026-03-30T22:00:00.000+00:00",
      "generator": {
        "date": "2026-03-31T08:09:16.657+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.5.0"
        }
      },
      "id": "WID-SEC-W-2026-0892",
      "initial_release_date": "2026-03-26T23:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-03-26T23:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-03-30T22:00:00.000+00:00",
          "number": "2",
          "summary": "Referenz(en) aufgenommen: EUVD-2026-17079, EUVD-2026-17081"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c2026.2",
                "product": {
                  "name": "WatchGuard Firebox \u003c2026.2",
                  "product_id": "T052214"
                }
              },
              {
                "category": "product_version",
                "name": "2026.2",
                "product": {
                  "name": "WatchGuard Firebox 2026.2",
                  "product_id": "T052214-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:watchguard:firebox:2026.2"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c12.12",
                "product": {
                  "name": "WatchGuard Firebox \u003c12.12",
                  "product_id": "T052215"
                }
              },
              {
                "category": "product_version",
                "name": "12.12",
                "product": {
                  "name": "WatchGuard Firebox 12.12",
                  "product_id": "T052215-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:watchguard:firebox:12.12"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c12.5.18",
                "product": {
                  "name": "WatchGuard Firebox \u003c12.5.18",
                  "product_id": "T052216"
                }
              },
              {
                "category": "product_version",
                "name": "12.5.18",
                "product": {
                  "name": "WatchGuard Firebox 12.5.18",
                  "product_id": "T052216-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:watchguard:firebox:12.5.18"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "11.x",
                "product": {
                  "name": "WatchGuard Firebox 11.x",
                  "product_id": "T052217",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:watchguard:firebox:11.x"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Firebox"
          }
        ],
        "category": "vendor",
        "name": "WatchGuard"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-4266",
      "product_status": {
        "known_affected": [
          "T052216",
          "T052217",
          "T052214",
          "T052215"
        ]
      },
      "release_date": "2026-03-26T23:00:00.000+00:00",
      "title": "CVE-2026-4266"
    },
    {
      "cve": "CVE-2026-4315",
      "product_status": {
        "known_affected": [
          "T052216",
          "T052217",
          "T052214",
          "T052215"
        ]
      },
      "release_date": "2026-03-26T23:00:00.000+00:00",
      "title": "CVE-2026-4315"
    }
  ]
}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-4266 (GCVE-0-2026-4266)

GHSA-MMHR-MFJP-VV8J

FKIE_CVE-2026-4266

WID-SEC-W-2026-0892

Tags

Sightings

Nomenclature