FKIE_CVE-2026-55836

Vulnerability from fkie_nvd - Published: 2026-10-16 16:18 - Updated: 2026-10-16 20:04
Severity
6.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Summary
Open Zaak is an open-source data and services layer for Dutch case-oriented working. From 1.13.0 until 1.27.2, 1.28.2, and 1.29.0, _import_document_row in src/openzaak/components/documenten/tasks.py uses the attacker-controlled bestandspad CSV field without ensuring that the resolved path remains under IMPORT_DOCUMENTEN_BASE_DIR. A client with an all-authorizations application token can supply an absolute or parent-traversal path to a file readable by the Celery service account. The worker copies that file into document storage, allowing its contents to be retrieved through the normal document download API and exposing server secrets or other private files. This issue is fixed in versions 1.27.2, 1.28.2, and 1.29.0.
References
security-advisories@github.comhttps://github.com/open-zaak/open-zaak/commit/4b23957b55ab792bc2ba1fbc5ce6918881b62ab8
security-advisories@github.comhttps://github.com/open-zaak/open-zaak/commit/69c78ce2a0edb45bec8809bc2205585c5f8a4054
security-advisories@github.comhttps://github.com/open-zaak/open-zaak/commit/8acd5e59e0132aa19284bf22f7b3defca279e2ce
security-advisories@github.comhttps://github.com/open-zaak/open-zaak/releases/tag/1.27.2
security-advisories@github.comhttps://github.com/open-zaak/open-zaak/releases/tag/1.28.2
security-advisories@github.comhttps://github.com/open-zaak/open-zaak/releases/tag/1.29.0
security-advisories@github.comhttps://github.com/open-zaak/open-zaak/security/advisories/GHSA-x5cj-23hr-5r54
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/open-zaak/open-zaak/security/advisories/GHSA-x5cj-23hr-5r54
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "open-zaak",
          "vendor": "open-zaak",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.13.0, \u003c 1.27.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.28.0, \u003c 1.28.2"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Open Zaak is an open-source data and services layer for Dutch case-oriented working. From 1.13.0 until 1.27.2, 1.28.2, and 1.29.0, _import_document_row in src/openzaak/components/documenten/tasks.py uses the attacker-controlled bestandspad CSV field without ensuring that the resolved path remains under IMPORT_DOCUMENTEN_BASE_DIR. A client with an all-authorizations application token can supply an absolute or parent-traversal path to a file readable by the Celery service account. The worker copies that file into document storage, allowing its contents to be retrieved through the normal document download API and exposing server secrets or other private files. This issue is fixed in versions 1.27.2, 1.28.2, and 1.29.0."
    }
  ],
  "id": "CVE-2026-55836",
  "lastModified": "2026-10-16T20:04:29.760",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.8,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "HIGH",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.3,
        "impactScore": 4.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-55836",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-16T16:01:07.670750Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-16T16:18:43.897",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/open-zaak/open-zaak/commit/4b23957b55ab792bc2ba1fbc5ce6918881b62ab8"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/open-zaak/open-zaak/commit/69c78ce2a0edb45bec8809bc2205585c5f8a4054"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/open-zaak/open-zaak/commit/8acd5e59e0132aa19284bf22f7b3defca279e2ce"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/open-zaak/open-zaak/releases/tag/1.27.2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/open-zaak/open-zaak/releases/tag/1.28.2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/open-zaak/open-zaak/releases/tag/1.29.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/open-zaak/open-zaak/security/advisories/GHSA-x5cj-23hr-5r54"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/open-zaak/open-zaak/security/advisories/GHSA-x5cj-23hr-5r54"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-200"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}



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