---
title: "CVE-2026-27584: ActualBudget server is Missing Authentication for SimpleFIN and Pluggy AI bank sync endpoints"
url: https://erroneo.us/security/cve/CVE-2026-27584/
description: "CVE-2026-27584 (@actual-app/sync-server (npm)): Actual is a local-first personal finance tool. Prior to version 26.2.1, missing authentication middleware in…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-02-24
date_modified: 2026-02-27
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-27584"
kev: false
cvss: 9.2
epss: 0.0057
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.6% , percentile 46: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 46% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes @actual-app/sync-server (npm) < 26.2.1, fixed in 26.2.1 . Check your lockfile, including transitive dependencies.

## What it is

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

- npm `@actual-app/sync-server` < 26.2.1 → fixed: 26.2.1

## Affected products (CVE record)

- actualbudget actual: < 26.2.1

## Severity

- GitHub_M CVSS 4.0: 9.2 `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`
- GitHub CVSS 4.0: 9.2 `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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.57% probability of exploitation activity in the next 30 days; percentile 46.

## Sources

- [GitHub Advisory GHSA-m2cq-xjgm-f668](https://github.com/advisories/GHSA-m2cq-xjgm-f668)
- [CVE.org record CVE-2026-27584](https://www.cve.org/CVERecord?id=CVE-2026-27584)
- [NVD entry CVE-2026-27584](https://nvd.nist.gov/vuln/detail/CVE-2026-27584)
- [github.com](https://github.com/actualbudget/actual/security/advisories/GHSA-m2cq-xjgm-f668)
- [github.com](https://github.com/actualbudget/actual/commit/ea937d100956ca56689ff852d99c28589e2a7d88)

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Source page: https://erroneo.us/security/cve/CVE-2026-27584/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt