Vulnerability details

CVE-2026-57458

go-vikunja vikunja

Vikunja: Scoped API token can mint unrestricted OAuth session credentials

CVSS 3.1

8.1High

Official 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.

CVSS scores

Score	Version	Source	Vector
8.1High	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N`

Affected products

Vendor	Product	Versions	Source
go-vikunja	vikunja	= 2.3.0	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/go-vikunja/vikunja/commit/4ae2e093014881052ed8f8ecd8bcb9adf83dd276 x_refsource_MISC
https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0 x_refsource_MISC
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v3p6-34mc-hj7v x_refsource_CONFIRM

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Details

Published: 2026-10-10
Last updated: 2026-10-13
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.33%

Probability of exploitation in 30 days

26.3%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: Proof of concept
Technical impact: Total

Weaknesses (CWE)

CWE-269
Improper Privilege Management