FKIE_CVE-2026-3089

Vulnerability from fkie_nvd - Published: 2026-03-09 14:16 - Updated: 2026-06-17 10:43
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Summary
Actual Sync Server allows authenticated users to upload files through POST /sync/upload-user-file. In versions prior to 26.3.0, improper validation of the user-controlled x-actual-file-id header means that traversal segments (../) can escape the intended directory and write files outside userFiles.This issue affects prior versions of Actual Sync Server 26.3.0.
References
help@fluidattacks.comhttps://fluidattacks.com/advisories/fugueExploit, Third Party Advisory
help@fluidattacks.comhttps://github.com/actualbudget/actualProduct
help@fluidattacks.comhttps://github.com/actualbudget/actual/pull/7067Issue Tracking, Patch
134c704f-9b21-4f2e-91b3-4a467353bcc0https://fluidattacks.com/advisories/fugueExploit, Third Party Advisory
Impacted products
Vendor Product Version
actualbudget actual *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://registry.npmjs.org",
          "defaultStatus": "unaffected",
          "packageName": "@actual-app/sync-server",
          "platforms": [
            "Windows",
            "MacOS",
            "Linux"
          ],
          "product": "Actual Sync Server",
          "vendor": "Actual",
          "versions": [
            {
              "status": "affected",
              "version": "26.2.1"
            }
          ]
        }
      ],
      "source": "help@fluidattacks.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:actualbudget:actual:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "A7399ED0-2E66-4A0C-8463-A2647306D5FE",
              "versionEndExcluding": "26.3.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Actual Sync Server allows authenticated users to upload files through POST /sync/upload-user-file. In versions prior to 26.3.0, improper validation of the user-controlled x-actual-file-id header means that traversal segments (../) can escape the intended directory and write files outside userFiles.This issue affects prior versions of Actual Sync Server 26.3.0."
    },
    {
      "lang": "es",
      "value": "Actual Sync Server permite a usuarios autenticados subir archivos a trav\u00e9s de POST /sync/upload-user-file. En versiones anteriores a la 26.3.0, una validaci\u00f3n incorrecta del encabezado x-actual-file-id controlado por el usuario significa que los segmentos de recorrido (../) pueden escapar del directorio previsto y escribir archivos fuera de userFiles. Este problema afecta a versiones anteriores de Actual Sync Server 26.3.0."
    }
  ],
  "id": "CVE-2026-3089",
  "lastModified": "2026-06-17T10:43:01.840",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "help@fluidattacks.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-3089",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-03-09T14:54:20.508514Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-03-09T14:16:10.143",
  "references": [
    {
      "source": "help@fluidattacks.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://fluidattacks.com/advisories/fugue"
    },
    {
      "source": "help@fluidattacks.com",
      "tags": [
        "Product"
      ],
      "url": "https://github.com/actualbudget/actual"
    },
    {
      "source": "help@fluidattacks.com",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/actualbudget/actual/pull/7067"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://fluidattacks.com/advisories/fugue"
    }
  ],
  "sourceIdentifier": "help@fluidattacks.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "help@fluidattacks.com",
      "type": "Secondary"
    }
  ]
}



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