CVE-2026-48777

{
  "id": "CVE-2026-48777",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-16T20:16:46.583",
  "lastModified": "2026-10-25T23:10:00.167",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "FileBrowser Quantum is a free, self-hosted, web-based file manager. Versions prior to 1.3.2-stable, 1.4.0-beta and 1.4.1-beta are vulnerable to Path Traversal through the publicPatchHandler in backend/http/public.go which joins user-controlled fromPath and toPath body fields with the trusted d.share.Path BEFORE the downstream sanitizer runs. Because filepath.Join collapses .. segments during the join, the sanitizer in resourcePatchHandler never sees the traversal and the move/copy/rename operates on a path outside the shared directory. The same root-cause pattern was patched for the bulk DELETE endpoint as CVE-2026-44542 (GHSA-fwj3-42wh-8673), but the PATCH handler with the identical pattern was not updated. A public share link with AllowModify=true is sufficient to exploit this. Anyone holding such a link can move, copy, or rename arbitrary files within the share owner's source root. This issue has been fixed in versions 1.3.3-stable and 1.4.2-beta."
    },
    {
      "lang": "es",
      "value": "FileBrowser Quantum es un gestor de archivos gratuito, autoalojado y basado en web. Las versiones anteriores a 1.3.2-stable, 1.4.0-beta y 1.4.1-beta son vulnerables a un salto de ruta a través del gestor publicPatchHandler en backend/http/public.go, que une los campos del cuerpo fromPath y toPath controlados por el usuario con la ruta de confianza d.share.Path ANTES de que se ejecute el saneador posterior. Debido a que filepath.Join colapsa los segmentos .. durante la unión, el saneador en resourcePatchHandler nunca ve el salto de ruta y la operación de mover/copiar/renombrar opera en una ruta fuera del directorio compartido. El mismo patrón de causa raíz fue parcheado para el endpoint DELETE masivo como CVE-2026-44542 (GHSA-fwj3-42wh-8673), pero el gestor PATCH con el patrón idéntico no fue actualizado. Un enlace de compartición público con AllowModify=true es suficiente para explotar esto. Cualquiera que posea dicho enlace puede mover, copiar o renombrar archivos arbitrarios dentro de la raíz de origen del propietario del recurso compartido. Este problema ha sido corregido en las versiones 1.3.3-stable y 1.4.2-beta."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "gtsteffaniak",
          "product": "filebrowser",
          "versions": [
            {
              "version": "< 1.3.3-stable",
              "status": "affected"
            },
            {
              "version": ">= 1.4.0-beta, < 1.4.2-beta",
              "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:N/VC:H/VI:H/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": 9.3,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "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": "2026-06-17T14:45:43.580327Z",
          "id": "CVE-2026-48777",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/gtsteffaniak/filebrowser/releases/tag/v1.3.3-stable",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/gtsteffaniak/filebrowser/releases/tag/v1.4.2-beta",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-qqqm-5547-774x",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-qqqm-5547-774x",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}