Actual Sync Server 26.2.1 - Authenticated Path Traversal
Priority MEDIUM 63CWE-22Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00416 36th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed @actual-app/sync-server (npm): 26.3.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Actual | Actual Sync Server | 26.2.1 | — | No fix listed | CNA |
| — | @actual-app/sync-server (npm) | before 26.3.0 | 26.3.0 | Patch available | GHSA-27vg-33gh-4hwg |
- Actual Sync Server VendorActual Affected 26.2.1 Fixed in — No fix listed CNA
- @actual-app/sync-server (npm) Vendor— Affected before 26.3.0 Fixed in 26.3.0 Patch available GHSA-27vg-33gh-4hwg
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:actualbudget:actual:*:*:*:*:*:node.js:*:* | before 26.3.0 | Vulnerable | actualbudget |
- cpe:2.3:a:actualbudget:actual:*:*:*:*:*:node.js:*:* Versions before 26.3.0 Vulnerable ·actualbudget
Remediation
- Fix · GHSA-27vg-33gh-4hwg @actual-app/sync-server (npm) Fixed in 26.3.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-3089
- 2026-10-03 Alias added: GHSA-27vg-33gh-4hwg
References
More actualbudget Actual vulnerabilities
- TI-2026-21972 ActualBudget server is Missing Authentication for SimpleFIN and Pluggy AI bank sync endpoints CVSS 4.0CRITICAL 9.2
- TI-2026-25729 Actual has Privilege Escalation via 'change-password' Endpoint on OpenID-Migrated Servers CVSS 3.1HIGH 8.8
- TI-2026-22020 ActualBudget missing authorization in sync endpoints allows cross-user budget file access in multi-user mode CVSS 4.0MEDIUM 5.7
Sources
- CVE-2026-3089 · CVE Program
- CVE-2026-3089 · NVD
- FIRST EPSS
- GHSA-27vg-33gh-4hwg · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences