CVE-2026-7888

Estado: AplazadaAlta (8.4)—

Concrete CMS below 9.5.3 is vulnerable to PHP Object Injection via unserialize() calls in the Workflow, Form block, and File/Set components that lack the allowed_classes restriction. The Form block and File/Set sinks were addressed in 9.5.2; the Workflow component sinks were addressed in 9.5.3. An unauthenticated attacker may trigger arbitrary PHP object instantiation if a malicious serialized payload has been placed in the database. Thanks XananasX7 and Sanjorn Keeratirungsan (dizconnect) for independently reporting the original components, and sh4d0byss for reporting the Workflow component wasn't fixed in 9.5.2. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 8.4 with 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.

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: 30
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.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Impacto principalT1059 Command and Scripting Interpreterexecution80 %
Impacto secundarioT1565.001 Stored Data Manipulationimpact60 %

AV:L + PR:H + acceso local sin interacción = T1068. PHP Object Injection (CWE-502) vía unserialize() permite instanciación de objetos arbitrarios, típicamente conducente a RCE (T1059) o manipulación de datos en BD (T1565.001).

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

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Restrict File and Directory Permissions Privileged Account Management Remote Data Storage

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Concretecms — Concrete CMS^AI

CWE

CWE-502

Referencias

https://documentation.concretecms.org/9-x/developers/introduction/version-history/952-release-notes

JSON original (NVD)

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  "id": "CVE-2026-7888",
  "cveTags": [],
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          "id": "CVE-2026-7888",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-03T19:07:44.886735Z"
        }
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    ],
    "cvssMetricV40": [
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        "source": "ff5b8ace-8b95-4078-9743-eac1ca5451de",
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          "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"
        }
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  },
  "affected": [
    {
      "source": "ff5b8ace-8b95-4078-9743-eac1ca5451de",
      "affectedData": [
        {
          "repo": "https://github.com/concretecms/concretecms",
          "vendor": "Concrete CMS",
          "product": "Concrete CMS",
          "versions": [
            {
              "status": "affected",
              "version": "5.0",
              "versionType": "git",
              "lessThanOrEqual": "9.5.2"
            }
          ],
          "collectionURL": "https://github.com/concretecms/concretecms",
          "defaultStatus": "unaffected"
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  "published": "2026-06-03T19:16:38.910",
  "references": [
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  "vulnStatus": "Deferred",
  "weaknesses": [
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      "type": "Secondary",
      "source": "ff5b8ace-8b95-4078-9743-eac1ca5451de",
      "description": [
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          "lang": "en",
          "value": "CWE-502"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Concrete CMS below 9.5.3 is vulnerable to PHP Object Injection via unserialize()\ncalls in the Workflow, Form block, and File/Set components that lack the\nallowed_classes restriction. The Form block and File/Set sinks were addressed in\n9.5.2; the Workflow component sinks were addressed in 9.5.3. An unauthenticated\nattacker may trigger arbitrary PHP object instantiation if a malicious serialized\npayload has been placed in the database. Thanks XananasX7 and Sanjorn Keeratirungsan\n(dizconnect) for independently reporting the original components, and sh4d0byss for\nreporting the Workflow component wasn't fixed in 9.5.2. The Concrete CMS security team gave this\nvulnerability a CVSS v.4.0 score of 8.4 with vector CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/\nVC:H/VI:H/VA:H/SC:N/SI:N/SA:N."
    },
    {
      "lang": "es",
      "value": "Concrete CMS anterior a 9.5.2 es vulnerable a la Inyección de objetos PHP a través de llamadas a unserialize() en los componentes Workflow, Form block y File/Set que carecen de la restricción allowed_classes. Un atacante no autenticado puede desencadenar la instanciación arbitraria de objetos PHP si se ha colocado una carga útil serializada maliciosa en la base de datos. Gracias a XananasX7 y Sanjorn Keeratirungsan (dizconnect) por informar ambos de forma independiente. El equipo de seguridad de Concrete CMS otorgó a esta vulnerabilidad una puntuación CVSS v.4.0 de 8.4 con el 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."
    }
  ],
  "lastModified": "2026-09-11T20:18:54.320",
  "sourceIdentifier": "ff5b8ace-8b95-4078-9743-eac1ca5451de"
}