CVE-2026-10303

{
  "id": "CVE-2026-10303",
  "sourceIdentifier": "44488dab-36db-4358-99f9-bc116477f914",
  "published": "2026-06-16T20:16:26.963",
  "lastModified": "2026-10-25T23:10:00.167",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In ServerCo getssl version 2.49 and prior, the ACME challenge token returned to the client was not strictly validated against RFC 8555 before being used in challenge-file handling, allowing a maliciously crafted token to influence local path/filename usage during validation. An attacker who can supply ACME challenge responses to getssl (for example, a malicious or compromised CA endpoint, or an on-path adversary able to tamper with that response path) could exploit this to achieve unauthorized file write/path traversal effects, usually with elevated privileges, ultimately allowing for remote command injection. This issue appears related in spirit to CVE-2023-38198, and is an instance of CWE-73, \"External control of file name or path.\" Other ACME shell script handlers may be affected by similar issues."
    },
    {
      "lang": "es",
      "value": "En ServerCo getssl versión 2.49 y anteriores, el token de desafío ACME devuelto al cliente no se validaba estrictamente contra RFC 8555 antes de ser utilizado en el manejo de archivos de desafío, permitiendo que un token maliciosamente elaborado influyera en el uso local de rutas/nombres de archivo durante la validación. Un atacante que pueda proporcionar respuestas de desafío ACME a getssl (por ejemplo, un endpoint de CA malicioso o comprometido, o un adversario en la ruta capaz de manipular esa ruta de respuesta) podría explotar esto para lograr efectos de escritura de archivos no autorizada/salto de ruta, generalmente con privilegios elevados, lo que en última instancia permitiría la inyección de comandos remota. Este problema parece relacionado en espíritu con CVE-2023-38198, y es una instancia de CWE-73, ’Control externo de nombre o ruta de archivo’. Otros manejadores de scripts de shell ACME pueden verse afectados por problemas similares."
    }
  ],
  "affected": [
    {
      "source": "44488dab-36db-4358-99f9-bc116477f914",
      "affectedData": [
        {
          "vendor": "ServerCo",
          "product": "getssl",
          "defaultStatus": "unaffected",
          "repo": "https://github.com/srvrco/getssl",
          "versions": [
            {
              "version": "0",
              "lessThanOrEqual": "2.49",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "44488dab-36db-4358-99f9-bc116477f914",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "baseScore": 7.4,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-17T15:17:32.277126Z",
          "id": "CVE-2026-10303",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "44488dab-36db-4358-99f9-bc116477f914",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-73"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/srvrco/getssl/pull/896",
      "source": "44488dab-36db-4358-99f9-bc116477f914"
    },
    {
      "url": "https://github.com/srvrco/getssl/releases/tag/v2.50",
      "source": "44488dab-36db-4358-99f9-bc116477f914"
    },
    {
      "url": "https://remyhax.xyz/posts/reproducing-lawful-tls-wiretapping/",
      "source": "44488dab-36db-4358-99f9-bc116477f914"
    },
    {
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-38198",
      "source": "44488dab-36db-4358-99f9-bc116477f914"
    },
    {
      "url": "https://www.runzero.com/advisories/serverco-getssl-acme-cmd-injection-cve-2026-10303/",
      "source": "44488dab-36db-4358-99f9-bc116477f914"
    }
  ]
}