Medium 5.3Published Mar 9, 2026

CVE-2026-3089Actual Sync Server 26.2.1 - Authenticated Path Traversal

Updated under an hour ago (Oct 26, 2026, 11:30 AM ET)

Does this affect you?

It affects Actual Sync Server and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Actual Sync Server

Exploited in the last 30 days

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: 5.3 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-22
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Fluid Attacks
NVD analysis: Analyzed
Record last updated: Mar 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Actual Actual Sync Server actual:sync_server (from the name)	26.2.1	CNA record
actualbudget actual actualbudget:actual	before 26.3.0	NVD

References

https://fluidattacks.com/advisories/fuguethird-party-advisory, exploit
https://github.com/actualbudget/actualproduct
https://github.com/actualbudget/actual/pull/7067patch, issue-tracking

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.