CVE-2026-27638 Vulnerability Analysis & Exploit Details

CVE-2026-27638
Vulnerability Scoring

7.1
/10
Very High Risk

Highly exploitable, CVE-2026-27638 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-27638 Details

Status: Analyzed

Last updated: 🕔 27 Feb 2026, 17:03 UTC
Originally published on: 🕚 26 Feb 2026, 23:16 UTC

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

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

CVE-2026-27638 Vulnerability Summary

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 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.

Assessing the Risk of CVE-2026-27638

Access Complexity Graph

The exploitability of CVE-2026-27638 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-27638

CVE-2026-27638 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-27638, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-27638, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: Low
    CVE-2026-27638 could lead to minor leaks of non-critical information without major privacy breaches.
  • Integrity: High
    CVE-2026-27638 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: None
    CVE-2026-27638 does not impact system availability.

CVE-2026-27638 References

External References

CWE Common Weakness Enumeration

CWE-862

CAPEC Common Attack Pattern Enumeration and Classification

  • Exploitation of Thunderbolt Protection Flaws CAPEC-665 An adversary leverages a firmware weakness within the Thunderbolt protocol, on a computing device to manipulate Thunderbolt controller firmware in order to exploit vulnerabilities in the implementation of authorization and verification schemes within Thunderbolt protection mechanisms. Upon gaining physical access to a target device, the adversary conducts high-level firmware manipulation of the victim Thunderbolt controller SPI (Serial Peripheral Interface) flash, through the use of a SPI Programing device and an external Thunderbolt device, typically as the target device is booting up. If successful, this allows the adversary to modify memory, subvert authentication mechanisms, spoof identities and content, and extract data and memory from the target device. Currently 7 major vulnerabilities exist within Thunderbolt protocol with 9 attack vectors as noted in the Execution Flow.

Vulnerable Configurations

  • cpe:2.3:a:actualbudget:actual:22.12.9:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:22.12.9:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.1.12:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.1.12:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.2.5:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.2.5:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.2.9:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.2.9:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.3.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.3.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.3.2:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.3.2:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.4.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.4.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.4.1:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.4.1:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.4.2:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.4.2:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.5.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.5.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.6.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.6.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.7.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.7.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.7.1:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.7.1:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.7.2:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.7.2:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.8.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.8.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.8.1:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.8.1:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.9.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.9.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.10.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.10.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.11.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.11.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:23.12.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:23.12.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:24.1.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:24.1.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:24.2.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:24.2.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:24.3.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:24.3.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:24.4.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:24.4.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:24.5.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:24.5.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:24.6.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:24.6.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:24.7.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:24.7.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:24.8.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:24.8.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:24.9.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:24.9.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:24.10.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:24.10.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:24.10.1:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:24.10.1:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:24.11.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:24.11.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:24.12.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:24.12.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:25.1.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:25.1.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:25.2.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:25.2.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:25.2.1:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:25.2.1:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:25.3.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:25.3.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:25.3.1:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:25.3.1:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:25.4.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:25.4.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:25.5.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:25.5.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:25.6.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:25.6.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:25.6.1:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:25.6.1:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:25.7.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:25.7.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:25.7.1:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:25.7.1:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:25.8.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:25.8.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:25.9.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:25.9.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:25.10.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:25.10.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:25.11.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:25.11.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:25.12.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:25.12.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:26.1.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:26.1.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:actualbudget:actual:26.2.0:*:*:*:*:node.js:*:*
    cpe:2.3:a:actualbudget:actual:26.2.0:*:*:*:*:node.js:*:*

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