Is this vulnerability remotely exploitable?

Yes. Any remote user who can authenticate to the Actual instance in multi-user OpenID mode can attempt to exploit it by targeting file IDs belonging to other users.

Does this require administrative or elevated access?

No. The issue can be exploited by any regular authenticated user account; no administrative privileges are necessary.

What is the safest general fix pattern for developers?

The most robust fix is to enforce resource-level authorization in all sync endpoints by: - Explicitly binding each budget file to a user or tenant identifier, and - Verifying that the authenticated user matches this identifier (or has explicit delegated access) before reading or modifying the file.

Severity:

HIGH RISK

(7.1)

Missing Authorization Check (CWE-862) in Actual Sync API for Multi-User Budgets

CVE-2026-27638

Published:

Feb 26, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-78

CRITICAL RISK

CRITICAL

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Command Injection in MCP Stdio Configuration Validation (CWE-78) in WeKnora

Remote Code Execution

March 7, 2026

CWE-89

CRITICAL RISK

CRITICAL

(9.9)

SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Remote Code Execution via SQL Injection on the Database Server

March 7, 2026

Vulnerability Type

Category:

Missing Authorization

CWE:

CWE-862

Impact:

Unauthorized Access to and Modification of Sensitive User Data

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Missing Authorization

CWE:

CWE-862

Impact:

Unauthorized Access to and Modification of Sensitive User Data

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Missing Authorization Check (CWE-862) in Actual Sync API for Multi-User Budgets

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.9)

Command Injection in MCP Stdio Configuration Validation (CWE-78) in WeKnora

CRITICAL RISK

CRITICAL

(9.9)

SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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