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CVE-2026-26927

Full vulnerability record from the local CVENow database.

Description

Szafir SDK Web is a browser plug-in that can run SzafirHost application which download the necessary files when launched. In Szafir SDK Web it is possible to change the URL (HTTP Origin) of the application call location. An unauthenticated attacker can craft a website that is able to launch SzafirHost application with arbitrary arguments via Szafir SDK Web browser addon. No validation will be performed to check whether the address specified in `document_base_url` parameter is in any way related to the actual address of the calling web application. The URL address specified in `document_base_url` parameter is then shown in the application confirmation prompt. When a victim confirms the execution of the application, it will be called in the context of attacker's website URL and might download additional files and libraries from that website. When victim accepts the application execution for the URL showed in the confirmation prompt with the "remember" option before, the prompt won't be shown and the application will be called in the context of URL provided by the attacker without any interaction. This issue was fixed in version 0.0.17.4.

Severity
MEDIUM
CVSS score
5.1 (v4.0)
Vulnerability status
Deferred
Source identifier
Published
2026-04-02 14:16:25.873000
Last modified
2026-10-26 22:10:00.163000
View original CVE JSON
{
  "id": "CVE-2026-26927",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-02T14:16:25.873",
  "lastModified": "2026-10-26T22:10:00.163",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Szafir SDK Web is a browser plug-in that can run SzafirHost application which download the necessary files when launched.\nIn Szafir SDK Web it is possible to change the URL (HTTP Origin) of the application call location. An unauthenticated attacker can craft a website that is able to launch SzafirHost application with arbitrary arguments via Szafir SDK Web browser addon. No validation will be performed to check whether the address specified in `document_base_url` parameter is in any way related to the actual address of the calling web application. The URL address specified in `document_base_url` parameter is then shown in the application confirmation prompt. When a victim confirms the execution of the application, it will be called in the context of attacker's website URL and might download additional files and libraries from that website. When victim accepts the application execution for the URL showed in the confirmation prompt with the \"remember\" option before, the prompt won't be shown and the application will be called in the context of URL provided by the attacker without any interaction.\n\nThis issue was fixed in version 0.0.17.4."
    },
    {
      "lang": "es",
      "value": "Szafir SDK Web es un complemento de navegador que puede ejecutar la aplicación SzafirHost, la cual descarga los archivos necesarios cuando se inicia.\nEn Szafir SDK Web es posible cambiar la URL (Origen HTTP) de la ubicación de llamada de la aplicación. Un atacante no autenticado puede crear un sitio web que sea capaz de iniciar la aplicación SzafirHost con argumentos arbitrarios a través del complemento de navegador Szafir SDK Web. No se realizará ninguna validación para comprobar si la dirección especificada en el parámetro ’document_base_url’ está de alguna manera relacionada con la dirección real de la aplicación web que realiza la llamada. La dirección URL especificada en el parámetro ’document_base_url’ se muestra entonces en la ventana de confirmación de la aplicación. Cuando una víctima confirma la ejecución de la aplicación, esta se llamará en el contexto de la URL del sitio web del atacante y podría descargar archivos y bibliotecas adicionales de ese sitio web. Cuando la víctima acepta la ejecución de la aplicación para la URL mostrada en la ventana de confirmación con la opción ’recordar’ previamente, la ventana no se mostrará y la aplicación se llamará en el contexto de la URL proporcionada por el atacante sin ninguna interacción.\n\nEste problema se solucionó en la versión 0.0.17.4."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Krajowa Izba Rozliczeniowa",
          "product": "Szafir SDK Web",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "lessThan": "0.0.17.4",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/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",
          "baseScore": 5.1,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "userInteraction": "ACTIVE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-02T14:19:08.706495Z",
          "id": "CVE-2026-26927",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-348"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://cert.pl/posts/2026/04/CVE-2026-26927",
      "source": "[email protected]"
    },
    {
      "url": "https://www.elektronicznypodpis.pl/",
      "source": "[email protected]"
    }
  ]
}