How severe is CVE-2026-3089?

CVE-2026-3089 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-3089 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3089?

CVE-2026-3089 affects Actualbudget Actual. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3089?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-3089 have an EU (EUVD) identifier?

Yes. CVE-2026-3089 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10340.

When was CVE-2026-3089 published?

CVE-2026-3089 was published on 2026-03-09 and last updated on 2026-06-17.

CVE-2026-3089

CVE-2026-3089 is a medium-severity vulnerability in Actualbudget Actual with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 5.3
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10340
Weakness: CWE-22
Affected product: Actualbudget Actual
Published: 2026-03-09
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-3089?: 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.
How severe is CVE-2026-3089?: CVE-2026-3089 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-3089 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3089?: CVE-2026-3089 affects Actualbudget Actual. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3089?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3089 have an EU (EUVD) identifier?: Yes. CVE-2026-3089 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10340.
When was CVE-2026-3089 published?: CVE-2026-3089 was published on 2026-03-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:actualbudget:actual:*:*:*:*:*:node.js:*:*

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