CVE-2026-27638

Name: CVE-2026-27638
Creator: NVD / NIST
Published: 2026-02-26T23:16:34.807+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.7/10EPSS 0.29%

Last modified Jun 17, 2026

CVE-2026-27638 is a medium-severity vulnerability rated 5.7/10 on the CVSS scale. 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. EPSS estimates a 0.29% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.1/10

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

CVSS 4.0

5.7/10

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.29%

21.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-862

Affected Software

Vendor	Product	Versions
Actualbudget	Actual	< 26.2.1

References

https://github.com/actualbudget/actual/commit/9966c024cb75f57943193cac8e42f401efed9d08Patch
https://github.com/actualbudget/actual/releases/tag/v26.2.1Product, Release Notes
https://github.com/actualbudget/actual/security/advisories/GHSA-qmjj-p7m9-wjrvExploit, Vendor Advisory

Timeline

Published: Feb 26, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-27638?

How severe is CVE-2026-27638?

CVE-2026-27638 has a CVSS score of 5.7/10 (MEDIUM severity). The EPSS model estimates a 0.29% probability of exploitation in the next 30 days.

How do I fix CVE-2026-27638?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-27638?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST