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CVE-2026-27638 - Vulnerability Analysis

HighCVSS: 7.1

Last Updated: February 27, 2026

Actual - Broken Access Control

Published: February 26, 2026Updated: February 27, 2026PoC AvailableRemote Exploitable

Overview

Actual before 26.2.1 contains a broken access control vulnerability caused by lack of ownership verification in sync API endpoints, letting authenticated users read and modify other users' budget files, exploit requires authentication.

Severity & Score

Severity: High

CVSS Score: 7.1

Impact

Authenticated users can read, modify, and overwrite other users' budget files, risking data integrity and privacy.

Mitigation

Update to version 26.2.1 or later.

References

https://github.com/actualbudget/actual/commit/9966c024cb75f57943193cac8e42f401efed9d08
https://github.com/actualbudget/actual/releases/tag/v26.2.1
https://github.com/actualbudget/actual/security/advisories/GHSA-qmjj-p7m9-wjrv

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Details

CVE ID: CVE-2026-27638
Severity: High
CVSS Score: 7.1
Type: broken_access_control
Status: confirmed

CWE

CWE-862

CVSS Metrics

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N