Vikunja: Scoped API token can mint unrestricted OAuth session credentials — GHSA-V3P6-34MC-HJ7V

Summary

## Summary A scoped API token can bypass its declared permissions by using the OAuth authorization flow to mint normal session credentials. A token limited to: ```json {"oauth":["authorize"]} ``` can call `/api/v1/oauth/authorize`, receive an OAuth authorization code, exchange it at `/api/v1/oauth/token`, and obtain a normal bearer JWT plus refresh token. The resulting credentials are not restricted by the original…

Timeline

Published by source

2026-10-09

Risk context

• Reported severity or threat level: high.
• Reported CVSS score: 8.1 out of 10.
• Review exposure for the affected product or family: go: code.vikunja.io/api.

Product

go: code.vikunja.io/api

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-V3P6-34MC-HJ7V

Source

GitHub

Vendor

GitHub

Published by source

2026-10-09

Last source activity

2026-10-09

Additional identifiers

CVE-2026-57458

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.