Medium 5.7Published Feb 26, 2026

CVE-2026-27638ActualBudget missing authorization in sync endpoints allows cross-user budget file access in multi-user mode

Updated under an hour ago (Oct 27, 2026, 8:10 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for actualbudget actual

Exploited in the last 30 days

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: 5.7 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
Weakness (CWE): CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 2, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

actualbudget actual actualbudget:actual (from the name)	before 26.2.1	CNA record
actualbudget actual actualbudget:actual	before 26.2.1	NVD

References

References

https://github.com/actualbudget/actual/security/advisories/GHSA-qmjj-p7m9-wjrv	x-refsource-confirm, exploit, vendor-advisory
https://github.com/actualbudget/actual/commit/9966c024cb75f57943193cac8e42f401efed9d08	x-refsource-misc, patch
https://github.com/actualbudget/actual/releases/tag/v26.2.1	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.