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

Quick assessment

Affected
actualbudget actual
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

actual是Actual开源的一个个人理财工具。 actual 26.2.1之前版本存在安全漏洞，该漏洞源于同步API端点未验证文件所有权，可能导致任意用户预算文件被读取或修改。

AI Predicted 8.1 Difficulty: Easy EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-27638

Vulnerability Information
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Vulnerability Title
ActualBudget missing authorization in sync endpoints allows cross-user budget file access in multi-user mode
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
actual 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
actual是Actual开源的一个个人理财工具。 actual 26.2.1之前版本存在安全漏洞，该漏洞源于同步API端点未验证文件所有权，可能导致任意用户预算文件被读取或修改。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
actualbudget actual < 26.2.1 -

II. Public POCs for CVE-2026-27638

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III. Intelligence Information for CVE-2026-27638

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Patches & Fixes for CVE-2026-27638 (1)

Vendor Advisories for CVE-2026-27638 (1)

IV. Related Vulnerabilities

Same product: actual
Same vendor: actualbudget
Same weakness: CWE-862

V. Comments for CVE-2026-27638

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