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CVE-2026-27638

Actualbudget Actual broken access control

7.1 HIGHPublic exploitEPSS 0.36%
  1. Published26 Feb 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityLow
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

Affected products

Actualbudget Actual< 26.2.1

Remediation

Fixed in
Actualbudget Actual≥ 26.2.1

References

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Frequently asked

Is CVE-2026-27638 being actively exploited?

CVE-2026-27638 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.36%.

How severe is CVE-2026-27638?

CVE-2026-27638 has a CVSS 3.1 base score of 7.1, rated high. EPSS estimates a 0.36% probability of exploitation.

Which products are affected by CVE-2026-27638?

Affected products include Actualbudget Actual.

How do I fix CVE-2026-27638?

Upgrade affected software to a fixed version, for example Actualbudget Actual 26.2.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-27638 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.