GHSA-27VG-33GH-4HWG

Vulnerability from github – Published: 2026-03-10 01:02 – Updated: 2026-03-10 01:02

Summary

Actual Sync Server has an Authenticated Path Traversal

Details

Description

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.

Mitigations

The vulnerability can be mitigated in prior versions by running the sync server in a filesystem sandbox.

Severity ?

5.3 (Medium)


                  
                    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

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JSON

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 26.2.0"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@actual-app/sync-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-3089"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-10T01:02:15Z",
    "nvd_published_at": "2026-03-09T14:16:10Z",
    "severity": "MODERATE"
  },
  "details": "# Description\n\nActual 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`.\n\n## Mitigations\nThe vulnerability can be mitigated in prior versions by running the sync server in a filesystem sandbox.",
  "id": "GHSA-27vg-33gh-4hwg",
  "modified": "2026-03-10T01:02:15Z",
  "published": "2026-03-10T01:02:15Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/actualbudget/actual/security/advisories/GHSA-27vg-33gh-4hwg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3089"
    },
    {
      "type": "WEB",
      "url": "https://github.com/actualbudget/actual/pull/7067"
    },
    {
      "type": "WEB",
      "url": "https://github.com/actualbudget/actual/commit/18072e1d8b5281db43ded8b21433ee177bae9dfa"
    },
    {
      "type": "WEB",
      "url": "https://fluidattacks.com/advisories/fugue"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/actualbudget/actual"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Actual Sync Server has an Authenticated Path Traversal"
}

CVE-2026-3089 (GCVE-0-2026-3089)

Vulnerability from cvelistv5 – Published: 2026-03-09 14:08 – Updated: 2026-03-09 14:54

Title

Actual Sync Server 26.2.1 - Authenticated Path Traversal

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.

Severity ?

5.3 (Medium)


                        
                          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

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

Fluid Attacks

References

URL

Tags

	https://fluidattacks.com/advisories/fugue	third-party-advisory
	https://github.com/actualbudget/actual	product
	https://github.com/actualbudget/actual/pull/7067	patch

Impacted products

	Vendor	Product	Version
	Actual	Actual Sync Server	Affected: 26.2.1

Credits

Juan Patarroyo

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JSON

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Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

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