CVE-2026-27638 (GCVE-0-2026-27638)

Vulnerability from cvelistv5 – Published: 2026-02-26 22:14 – Updated: 2026-02-26 22:14
VLAI?
Title
ActualBudget missing authorization in sync endpoints allows cross-user budget file access in multi-user mode
Summary
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't 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's budget files by providing their file ID. Version 26.2.1 patches the issue.
Severity ?
5.7 (Medium)
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
CWE
Assigner
References
Impacted products
Vendor Product Version
actualbudget actual Affected: < 26.2.1
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  "containers": {
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          "product": "actual",
          "vendor": "actualbudget",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 26.2.1"
            }
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        }
      ],
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        }
      ],
      "metrics": [
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            "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": [
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          ],
          "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": {
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  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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