CVE-2026-3089 json
Actual Sync Server 26.2.1 - Authenticated Path Traversal
published 8mo ago modified 4mo ago also GHSA-27vg-33gh-4hwg , EUVD-2026-10340
- cvss
- 6.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 36%
- public exploits
- 0
- none known
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.
Patch / fix
- npm @actual-app/sync-server 26.3.0
- actualbudget actual 26.3.0
- github.com/actualbudget/actual@18072e1 commit
- github.com/actualbudget/actual#7067 pull request
Is CVE-2026-3089 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 8mo ago
Exploit prediction
0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- fluidattacks.com https://fluidattacks.com/advisories/fugue referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.3 | 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 |
| CNA | 4.0 | 5.3 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @actual-app/sync-server | <26.3.0 |
26.3.0 |
Affected products
- Actual Actual Sync Server
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
-
github.com
/actualbudget/actual/pull/7067
patch, web, issue-tracking
-
github.com
/actualbudget/actual/commit/18072e1d8b5281db43ded8b21433ee177bae9dfa
web
-
fluidattacks.com
/advisories/fugue
third-party-advisory, exploit, web
-
github.com
/actualbudget/actual
product, package
-
github.com
/actualbudget/actual/security/advisories/GHSA-27vg-33gh-4hwg
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-3089
advisory
Sources
- CVE List CVE-2026-3089
- GitHub Advisory GHSA-27vg-33gh-4hwg
- NVD CVE-2026-3089
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.