{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "actual",
          "vendor": "actualbudget",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 26.2.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Actual is a local-first personal finance tool. Prior to version 26.2.1, in multi-user mode (OpenID), the sync API endpoints (`/sync/*`) don\u0027t verify that the authenticated user owns or has access to the file being operated on. Any authenticated user can read, modify, and overwrite any other user\u0027s budget files by providing their file ID. Version 26.2.1 patches the issue."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.7,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-862",
              "description": "CWE-862: Missing Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-26T22:14:21.481Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/actualbudget/actual/security/advisories/GHSA-qmjj-p7m9-wjrv",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/actualbudget/actual/security/advisories/GHSA-qmjj-p7m9-wjrv"
        },
        {
          "name": "https://github.com/actualbudget/actual/commit/9966c024cb75f57943193cac8e42f401efed9d08",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/actualbudget/actual/commit/9966c024cb75f57943193cac8e42f401efed9d08"
        },
        {
          "name": "https://github.com/actualbudget/actual/releases/tag/v26.2.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/actualbudget/actual/releases/tag/v26.2.1"
        }
      ],
      "source": {
        "advisory": "GHSA-qmjj-p7m9-wjrv",
        "discovery": "UNKNOWN"
      },
      "title": "ActualBudget missing authorization in sync endpoints allows cross-user budget file access in multi-user mode"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-27638",
    "datePublished": "2026-02-26T22:14:21.481Z",
    "dateReserved": "2026-02-20T22:02:30.029Z",
    "dateUpdated": "2026-02-26T22:14:21.481Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-27638\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-02-26T23:16:34.807\",\"lastModified\":\"2026-02-26T23:16:34.807\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Actual is a local-first personal finance tool. Prior to version 26.2.1, in multi-user mode (OpenID), the sync API endpoints (`/sync/*`) don\u0027t verify that the authenticated user owns or has access to the file being operated on. Any authenticated user can read, modify, and overwrite any other user\u0027s budget files by providing their file ID. Version 26.2.1 patches the issue.\"}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/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\":5.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"HIGH\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"PROOF_OF_CONCEPT\",\"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\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-862\"}]}],\"references\":[{\"url\":\"https://github.com/actualbudget/actual/commit/9966c024cb75f57943193cac8e42f401efed9d08\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/actualbudget/actual/releases/tag/v26.2.1\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/actualbudget/actual/security/advisories/GHSA-qmjj-p7m9-wjrv\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}