CVE-2026-57458
High
Description
Vikunja is an open-source self-hosted task management platform. In version 2.3.0, a scoped API token limited to the `oauth.authorize` permission can call `POST /api/v1/oauth/authorize`, obtain an OAuth authorization code, and exchange the code at `POST /api/v1/oauth/token` for a normal bearer JSON Web Token (JWT) and refresh token. The resulting credentials are not restricted by the original API token's permissions, allowing access to routes outside its declared scope for the same user. Version 2.4.0 fixes the vulnerability.
SeverityHigh
CVSS8.1
Exploit probability—
ProductCode.vikunja.io/api
PublishedOct 9, 2026
First seenOct 9, 2026
Weakness typeCWE-269Improper privilege management
How to fix
Update
- code.vikunja.io/api2.4.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| code.vikunja.io/apiGo | 2.3.0 ≤ v < 2.4.0, No range specified | 2.4.0 |
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