CVE-2026-3089 — MEDIUM (6.5)

Q: How severe is CVE-2026-3089?

CVE-2026-3089 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-3089?

Check the references section above for vendor advisories and patch information. Affected products include: Actualbudget Actual.

Vulnerability 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.This issue affects prior versions of Actual Sync Server 26.3.0.

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

HIGH

Availability

NONE

Affected Products

Vendor	Product	Versions
Actualbudget	Actual	< 26.3.0

Related Weaknesses (CWE)

CWE-22

References

https://fluidattacks.com/advisories/fugueExploitThird Party Advisory
https://github.com/actualbudget/actualProduct
https://github.com/actualbudget/actual/pull/7067Issue TrackingPatch
https://fluidattacks.com/advisories/fugueExploitThird Party Advisory

FAQ

What is CVE-2026-3089?

CVE-2026-3089 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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...

How severe is CVE-2026-3089?

CVE-2026-3089 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-3089?

Check the references section above for vendor advisories and patch information. Affected products include: Actualbudget Actual.