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CVE-2026-104907

Estado: AplazadaMedia (4.8)—

MISP contains a cross-site scripting (XSS) vulnerability in the remote event preview page. When a linked (remote) MISP server is configured, the event preview renders tag identifiers inside an inline JavaScript onclick attribute. The tag ID value was HTML-escaped but not sanitized for the JavaScript string context, meaning a malicious linked server could supply a tag ID containing characters (such as a single quote) that break out of the JavaScript string literal and inject arbitrary script.

Preconditions:

- A linked/remote MISP server is configured and connected to the local instance.

- The linked server supplies a crafted tag ID in an event.

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- An authenticated user views the event preview and interacts with the affected tag element.

Impact:

- Arbitrary JavaScript execution in the context of the viewing user's browser session, potentially allowing session hijacking, data exfiltration, or unauthorized actions on behalf of the user.

Affected versions: MISP prior to the fix commit (v2.5.48 or later, exact boundary unconfirmed).

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.

XSS en vista previa remota (CWE-79) mediante inyección en atributo onclick JavaScript. Requiere UI:A del usuario autenticado. Impacto: ejecución JavaScript (T1059.007) y potencial acceso a sesión/datos (T1012).

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

Restrict Web-Based ContentUser TrainingExecution PreventionBehavior Prevention on EndpointDisable or Remove Feature or ProgramApplication Isolation and Sandboxing

Tecnologías afectadas (1)

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

Misp — MispAI

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-104907",
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  "metrics": {
    "ssvcV203": [
      {
        "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
        "ssvcData": {
          "role": "Supplier",
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              "exploitation": "none"
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        "type": "Secondary",
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        "cvssData": {
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          "version": "4.0",
          "Recovery": "NOT_DEFINED",
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          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/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",
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          "vulnIntegrityImpact": "NONE",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
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          "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": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*"
          ],
          "repo": "https://github.com/MISP/MISP",
          "vendor": "MISP",
          "modules": [
            "Servers/preview_event"
          ],
          "product": "MISP",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "2.5.48",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "app/View/Servers/preview_event.ctp"
          ]
        }
      ]
    }
  ],
  "published": "2026-10-02T16:16:48.253",
  "references": [
    {
      "url": "https://github.com/MISP/MISP/commit/70ad174dd",
      "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
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      "type": "Secondary",
      "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        },
        {
          "lang": "en",
          "value": "CWE-116"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "MISP contains a cross-site scripting (XSS) vulnerability in the remote event preview page. When a linked (remote) MISP server is configured, the event preview renders tag identifiers inside an inline JavaScript onclick attribute. The tag ID value was HTML-escaped but not sanitized for the JavaScript string context, meaning a malicious linked server could supply a tag ID containing characters (such as a single quote) that break out of the JavaScript string literal and inject arbitrary script.\n\nPreconditions:\n\n- A linked/remote MISP server is configured and connected to the local instance.\n\n- The linked server supplies a crafted tag ID in an event.\n\n- An authenticated user views the event preview and interacts with the affected tag element.\n\nImpact:\n\n- Arbitrary JavaScript execution in the context of the viewing user's browser session, potentially allowing session hijacking, data exfiltration, or unauthorized actions on behalf of the user.\n\nAffected versions: MISP prior to the fix commit (v2.5.48 or later, exact boundary unconfirmed)."
    }
  ],
  "lastModified": "2026-10-02T17:17:04.823",
  "sourceIdentifier": "5a6e4751-2f3f-4070-9419-94fb35b644e8"
}