What is CVE-2026-27638?

CVE-2026-27638 is a high-severity vulnerability in Actualbudget Actual, classified under Missing Authorization. CVSS score: 7.1/10. Published 2026-02-26.

How severe is CVE-2026-27638?

High severity. CVSS v3 base score is 7.1 out of 10.

Auth bypass in Actualbudget Actual

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 authenti…

Vulnerability class: Broken Access Control

EPSS: 0.003 (21.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N.

Affected products

Actualbudget Actual — versions < 26.2.1

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (Product, x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-27638?: CVE-2026-27638 is a high-severity vulnerability in Actualbudget Actual, classified under Missing Authorization. CVSS score: 7.1/10. Published 2026-02-26.
How severe is CVE-2026-27638?: High severity. CVSS v3 base score is 7.1 out of 10.