How severe is CVE-2026-27638?

CVE-2026-27638 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability none.

Is CVE-2026-27638 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27638?

CVE-2026-27638 affects Actualbudget Actual. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27638?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-27638 have an EU (EUVD) identifier?

Yes. CVE-2026-27638 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8905.

When was CVE-2026-27638 published?

CVE-2026-27638 was published on 2026-02-26 and last updated on 2026-06-17.

CVE-2026-27638

CVE-2026-27638 is a high-severity vulnerability in Actualbudget Actual with a CVSS 3.x base score of 7.1. 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-862.

Key facts

Severity: High (CVSS 3.x base score 7.1)
CVSS v4: 5.7
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8905
Weakness: CWE-862
Affected product: Actualbudget Actual
Published: 2026-02-26
Last modified: 2026-06-17

Description

Actual is a local-first personal finance tool. Prior to version 26.2.1, in multi-user mode (OpenID), the sync API endpoints (`/sync/*`) don't verify that the authenticated user owns or has access to the file being operated on. Any authenticated user can read, modify, and overwrite any other user's budget files by providing their file ID. Version 26.2.1 patches the issue.

Frequently asked questions

What is CVE-2026-27638?: Actual is a local-first personal finance tool. Prior to version 26.2.1, in multi-user mode (OpenID), the sync API endpoints (`/sync/*`) don't verify that the authenticated user owns or has access to the file being operated on. Any authenticated user can read, modify, and overwrite any other user's budget files by providing their file ID. Version 26.2.1 patches the issue.
How severe is CVE-2026-27638?: CVE-2026-27638 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability none.
Is CVE-2026-27638 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27638?: CVE-2026-27638 affects Actualbudget Actual. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27638?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-27638 have an EU (EUVD) identifier?: Yes. CVE-2026-27638 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8905.
When was CVE-2026-27638 published?: CVE-2026-27638 was published on 2026-02-26 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Actualbudget Actual

CVE-2026-33318 — High (CVSS 8.8): Actual is a local-first personal finance tool. Prior to version 26.4.0, any authenticated user (including `BASIC` role)…
CVE-2026-27584 — High (CVSS 7.5): Actual is a local-first personal finance tool. Prior to version 26.2.1, missing authentication middleware in the…
CVE-2026-3089 — Medium (CVSS 6.5): Actual Sync Server allows authenticated users to upload files through POST /sync/upload-user-file. In versions prior to…

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