CVE-2026-3089

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 69% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
6.5
EG Score
6.5(medium)
EG Risk
60(Attend)
EG Risk 60/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

March 9, 2026

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Aug 2, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

Actual Sync Server 26.2.1 - Authenticated Path Traversal | Fluid Attacks

https://fluidattacks.com/advisories/fugue
github_pr

Validate file IDs for correctness

Fix merged in actualbudget/actual PR #7067 on 2026-02-24 — awaiting tagged release

https://github.com/actualbudget/actual/pull/7067
generic

GitHub - actualbudget/actual: A local-first personal finance app · GitHub

https://github.com/actualbudget/actual

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
@actual-app/sync-server—26.3.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 160 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:28 UTCEPSS rescore
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  1. 2026-08-23 00:19 UTCEPSS rescore
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  8. 2026-08-16 12:10 UTCEG score recompute
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  25. 2026-08-05 19:17 UTCEPSS rescore
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  27. 2026-08-04 10:38 UTCEPSS rescore
  28. 2026-08-04 01:41 UTCEG score recompute
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  44. 2026-07-23 03:08 UTCEG score recompute
  45. 2026-07-22 14:08 UTCEPSS rescore
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  48. 2026-07-19 14:31 UTCEPSS rescore
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  50. 2026-07-18 10:04 UTCEPSS rescore
  51. 2026-07-17 09:20 UTCOSV refresh
  52. 2026-07-16 17:03 UTCEPSS rescore
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  73. 2026-06-28 04:56 UTCEPSS rescore
  74. 2026-06-27 03:08 UTCEPSS rescore
  75. 2026-06-25 13:49 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-3089?
CVE-2026-3089 is a medium vulnerability published on March 9, 2026. 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…
When was CVE-2026-3089 disclosed?
CVE-2026-3089 was first published in the National Vulnerability Database on March 9, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-3089 actively exploited?
CVE-2026-3089 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 68.4% of all scored CVEs.
What is the CVSS score of CVE-2026-3089?
CVE-2026-3089 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-3089?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-3089, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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