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CVE-2026-24044

Estado: AplazadaCrítica (9.2)—

Element Server Suite Community Edition (ESS Community) deploys a Matrix stack using the provided Helm charts and Kubernetes distribution. The ESS Community Helm Chart secrets initialization hook (using matrix-tools container before 0.5.7) is using an insecure Matrix server key generation method, allowing network attackers to potentially recreate the same key pair, allowing them to impersonate the victim server.

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The secret is generated by the secrets initialization hook, in the ESS Community Helm Chart values, if both initSecrets.enabled is not set to false and synapse.signingKey is not defined. Given a server key in Matrix authenticates both requests originating from and events constructed on a given server, this potentially impacts confidentiality, integrity and availability of rooms which have a vulnerable server present as a member. The confidentiality of past conversations in end-to-end encrypted rooms is not impacted. The key generation issue was fixed in matrix-tools 0.5.7, released as part of ESS Community Helm Chart 25.12.1.

CVSS

Probabilidad de explotación (EPSS)

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.

Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network TrafficApplication Isolation and Sandboxing

Tecnologías afectadas (3)

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

Element — ESS Community Helm ChartAIElement — Server Suite Community EditionAIMatrix — Matrix-toolsAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-24044",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-24044",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-02-12T20:05:42.483919Z"
        }
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 9.2,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/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": "HIGH",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "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": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "element-hq",
          "product": "ess-helm",
          "versions": [
            {
              "status": "affected",
              "version": "< 25.12.1"
            }
          ]
        },
        {
          "vendor": "element-hq",
          "product": "matrix-tools",
          "versions": [
            {
              "status": "affected",
              "version": "< 0.5.7"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-02-12T20:16:09.237",
  "references": [
    {
      "url": "https://github.com/element-hq/ess-helm/blob/main/docs/maintenance.md#fixing-cve-2026-24044elementsec-2025-1670-manually",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/element-hq/ess-helm/releases/tag/25.12.2",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/element-hq/ess-helm/security/advisories/GHSA-qwcj-h6m8-vp6q",
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-336"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Element Server Suite Community Edition (ESS Community) deploys a Matrix stack using the provided Helm charts and Kubernetes distribution. The ESS Community Helm Chart secrets initialization hook (using matrix-tools container before 0.5.7) is using an insecure Matrix server key generation method, allowing network attackers to potentially recreate the same key pair, allowing them to impersonate the victim server. The secret is generated by the secrets initialization hook, in the ESS Community Helm Chart values, if both initSecrets.enabled is not set to false and synapse.signingKey is not defined. Given a server key in Matrix authenticates both requests originating from and events constructed on a given server, this potentially impacts confidentiality, integrity and availability of rooms which have a vulnerable server present as a member. The confidentiality of past conversations in end-to-end encrypted rooms is not impacted. The key generation issue was fixed in matrix-tools 0.5.7, released as part of ESS Community Helm Chart 25.12.1."
    },
    {
      "lang": "es",
      "value": "Element Server Suite Community Edition (ESS Community) despliega una pila de Matrix utilizando los gráficos Helm proporcionados y la distribución de Kubernetes. El hook de inicialización de secretos del gráfico Helm de ESS Community (utilizando el contenedor matrix-tools anterior a la versión 0.5.7) está utilizando un método inseguro de generación de claves de servidor de Matrix, permitiendo a los atacantes de red recrear potencialmente el mismo par de claves, lo que les permite suplantar al servidor víctima. El secreto es generado por el hook de inicialización de secretos, en los valores del gráfico Helm de ESS Community, si tanto initSecrets.enabled no está configurado como falso y synapse.signingKey no está definido. Dado que una clave de servidor en Matrix autentica tanto las solicitudes originadas desde como los eventos construidos en un servidor dado, esto impacta potencialmente la confidencialidad, integridad y disponibilidad de las salas que tienen un servidor vulnerable presente como miembro. La confidencialidad de las conversaciones pasadas en salas cifradas de extremo a extremo no se ve afectada. El problema de generación de claves fue solucionado en matrix-tools 0.5.7, lanzado como parte del gráfico Helm de ESS Community 25.12.1."
    }
  ],
  "lastModified": "2026-06-17T10:22:30.740",
  "sourceIdentifier": "security-advisories@github.com"
}