Vulnerability · Published Feb 24, 2026 · Assigned by GitHub_M
CVE-2026-27584ActualBudget server is Missing Authentication for SimpleFIN and Pluggy AI bank sync endpoints
Critical 9.2
In plain English
A critical-severity missing authentication in actual from actualbudget. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Actual is a local-first personal finance tool. Prior to version 26.2.1, missing authentication middleware in the ActualBudget server component allows any unauthenticated user to query the SimpleFIN and Pluggy.ai integration endpoints and read sensitive bank account balance and transaction information. This vulnerability allows an unauthenticated attacker to read the bank account balance and transaction history of ActualBudget users. This vulnerability impacts all ActualBudget Server users with the SimpleFIN or Pluggy.ai integrations configured. The ActualBudget Server instance must be reachable over the network. Version 26.2.1 patches the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @actual-app/sync-server | 26.2.1 | GHSA-m2cq-xjgm-f668 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| actualbudget | actual | < 26.2.1 |
Weakness: CWE-306 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N