High severity · published Oct 9, 2026
CVE-2026-57458
Vikunja: Scoped API token can mint unrestricted OAuth session credentials
8.1
CVSS
0.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VI
vikunja · go-vikunja
= 2.3.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57458
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57458
x_refsource_CONFIRM
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v3p6-34mc-hj7v
x_refsource_MISC
https://github.com/go-vikunja/vikunja/commit/4ae2e093014881052ed8f8ecd8bcb9adf83dd276
x_refsource_MISC
https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0
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