CVE-2026-4266
Estado: AnalizadaAlta (8.4)—
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.
Note, this vulnerability does not affect Firebox platforms that do not support the Access Portal feature, including the T15 and T35.
CVSS
- Versión: 4.0
- Vector: 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
- Puntuación base: 8.4
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.39%
- Percentil entre todas las CVEs puntuadas: 31
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Impacto principal
T1059Command and Scripting Interpreterexecution80 %
AV:L + PR:H + acceso al filesystem permiten escalada local. Insecure Deserialization (CWE-502) ejecuta código arbitrario en contexto portald, típicamente T1059.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-502
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-4266",
"cveTags": [],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-4266",
"role": "CISA Coordinator",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"version": "2.0.3",
"timestamp": "2026-03-30T00:00:00+00:00"
}
}
],
"cvssMetricV31": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 6.7,
"attackVector": "LOCAL",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "HIGH",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 0.8
}
],
"cvssMetricV40": [
{
"type": "Secondary",
"source": "5d1c2695-1a31-4499-88ae-e847036fd7e3",
"cvssData": {
"Safety": "NOT_DEFINED",
"version": "4.0",
"Recovery": "NOT_DEFINED",
"baseScore": 8.4,
"Automatable": "NOT_DEFINED",
"attackVector": "LOCAL",
"baseSeverity": "HIGH",
"valueDensity": "NOT_DEFINED",
"vectorString": "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",
"exploitMaturity": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"privilegesRequired": "HIGH",
"subIntegrityImpact": "NONE",
"vulnIntegrityImpact": "HIGH",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"vulnAvailabilityImpact": "HIGH",
"availabilityRequirement": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"subConfidentialityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"confidentialityRequirement": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED"
}
}
]
},
"affected": [
{
"source": "5d1c2695-1a31-4499-88ae-e847036fd7e3",
"affectedData": [
{
"vendor": "WatchGuard",
"product": "Fireware OS",
"versions": [
{
"status": "affected",
"version": "2025.1",
"lessThan": "2026.2",
"versionType": "custom"
},
{
"status": "affected",
"version": "12.1",
"lessThan": "12.12",
"versionType": "custom"
}
],
"platforms": [
"Default"
],
"defaultStatus": "unaffected"
},
{
"vendor": "WatchGuard",
"product": "Fireware OS",
"versions": [
{
"status": "affected",
"version": "12.1",
"lessThan": "12.11.9",
"versionType": "custom"
}
],
"platforms": [
"EUCC"
],
"defaultStatus": "unaffected"
}
]
}
],
"published": "2026-03-30T13:16:22.573",
"references": [
{
"url": "https://psirt.watchguard.com/CVE-2026-4266",
"tags": [
"Broken Link"
],
"source": "5d1c2695-1a31-4499-88ae-e847036fd7e3"
},
{
"url": "https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00007",
"tags": [
"Vendor Advisory"
],
"source": "5d1c2695-1a31-4499-88ae-e847036fd7e3"
}
],
"vulnStatus": "Analyzed",
"weaknesses": [
{
"type": "Secondary",
"source": "5d1c2695-1a31-4499-88ae-e847036fd7e3",
"description": [
{
"lang": "en",
"value": "CWE-502"
}
]
}
],
"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.\n\nNote, this vulnerability does not affect Firebox platforms that do not support the Access Portal feature, including the T15 and T35."
},
{
"lang": "es",
"value": "Una vulnerabilidad de deserialización insegura en WatchGuard Fireware OS permite a un atacante que ha obtenido acceso de escritura al sistema de archivos local a través de otra vulnerabilidad ejecutar código arbitrario en el contexto del usuario 'portald'. Este problema afecta a Fireware OS: 12.1 hasta 12.11.8 y 2025.1 hasta 2026.1.2.\n\nTenga en cuenta que esta vulnerabilidad no afecta a las plataformas Firebox que no admiten la función Access Portal, incluyendo los T-15 y T-35."
}
],
"lastModified": "2026-08-28T00:18:05.483",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "2E203901-C92E-46F2-BC38-76C0A78FEB41",
"versionEndExcluding": "2026.2",
"versionStartIncluding": "2025.1"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:watchguard:firebox_m295:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "615FF2CF-69DA-4890-9236-52D8D6FA0E71"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m395:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "A3439409-2FD6-447B-91CF-17D1C09E2A79"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m495:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "C0C0412F-AB02-4D13-B159-D0FCD2ECA3ED"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m595:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "575CC5EE-0278-489B-AA95-5EC5058D6FB9"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m695:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "5597F672-3C72-4BCF-AD3F-F16B6913EC2F"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_t115-w:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "E8AAE66B-DD19-4C90-8DFC-F77BA1541642"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_t125:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "7FC18430-C6B4-4395-BFF1-83BB005875BA"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_t125-w:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "1A7C1C91-8B6E-4FB0-841E-7F88B06B1435"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_t145:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "8FE309D6-BD5E-4D18-91C3-A492C3576115"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_t145-w:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "75959D39-0960-4836-96C7-DB8048DDE4B8"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_t185:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "D0087049-27C6-4B18-A645-72A8F63D7C6D"
}
],
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "E7F95977-B27E-4A05-8AB3-58443636187F",
"versionEndExcluding": "12.12",
"versionStartIncluding": "12.1"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:watchguard:firebox_cloud:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "BD0A5008-C4F7-434B-8C10-AEB5B1F9E071"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m270:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "E472917E-D6E1-4C2D-B37D-E76FCC7307CA"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m290:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "9A8C7779-4466-4A9E-B191-929E7746DFF7"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m370:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "6CE9A123-B769-4E56-845E-DC3DA6166C78"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m390:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "180FAE8C-2E73-4C09-AA11-0C82A7715FA3"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m440:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "309DBEF2-1D92-4641-827F-D99758B5FFA3"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m4600:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "D1E8CFC5-51FE-4D75-845F-D70C30AF11B0"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m470:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "BBFBA966-E052-4350-9544-3B5D484DBB6B"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m4800:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "EF1E586D-0E88-447A-95E8-5203EF869ADB"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m5600:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "1BC087C4-CB10-46D4-A746-0C462354410C"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m570:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "59389EA2-3067-4AF8-AEC5-FE79E269C170"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m5800:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "445FA7CD-D0AE-4176-9AE5-293B918DE654"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m590:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "1B4A7366-0304-431E-B3E4-719BA575CEAC"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m670:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "E8512B4A-5269-4067-B9C6-475A4E8AD313"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_m690:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "179C6166-87E1-44F8-B727-CDDE40C673D9"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_nv5:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "584107CC-6136-4AA1-AE68-73B93BDDB5B6"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_t20:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "9295217E-C1A0-4A69-A0F0-C44814BB376C"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_t25:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "7DC49246-2166-4681-8D67-4C0940884872"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_t40:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "CC853916-8BDC-4F7C-BA53-D6AB490A9444"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_t45:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "DCB1A254-DA3C-4032-B2C6-C9EBCE8EC15E"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_t55:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "D3562304-0317-4A3C-B622-D5CE01CC97F9"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_t70:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "327BA50A-366A-4367-93B8-328EC0136FA7"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_t80:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "D92ABD52-20F6-4AB1-801F-9E7B7B1B78A1"
},
{
"criteria": "cpe:2.3:h:watchguard:firebox_t85:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "3552F3BB-8021-4E87-987D-870699A7E619"
},
{
"criteria": "cpe:2.3:h:watchguard:fireboxv:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "4ECAE1D7-9868-4730-B645-44CB1B6FDE96"
}
],
"operator": "OR"
}
],
"operator": "AND"
}
],
"sourceIdentifier": "5d1c2695-1a31-4499-88ae-e847036fd7e3"
}