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CVE-2026-27638

ActualBudget missing authorization in sync endpoints allows cross-user budget file access in multi-user mode

Published: Feb 26, 2026Updated: Feb 27, 2026 Sources: CVE List NVD GHSACWE-862
7.1HIGH
NVD MITRE
EPSS Score
0.3%
Top 78.3%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:LI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-862

Affected Products

actualbudget
actualOn-prem
Consumer Software / productivity
npm
package-ecosystem
@actual-app/sync-server
OSS Libraries

Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

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Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
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References

https://github.com/actualbudget/actual/commit/9966c024cb75f57943193cac8e42f401efed9d08
github.com
https://github.com/actualbudget/actual/releases/tag/v26.2.1
github.com
https://github.com/actualbudget/actual/security/advisories/GHSA-qmjj-p7m9-wjrv
github.com
and 2 more references View all →

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