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[ CVE-2026-91983 · Published 15 Sep 2026 ]

Vikunja: API token scopes bypassed via task expand parameter (comments, reactions, time entry counts)

CVSS 4.3 EPSS <1%Fix available

[ Why it matters ]Priority signals

  • Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

Vikunja before 2.6.0 contains an API token scope bypass vulnerability in task read endpoints where authorization fails to inspect query string parameters. Attackers with limited token scopes can use the expand parameter to access restricted data like comments, reactions, and time entries without proper permission verification.

[ Fixes ]Fixes and patches

  • code.vikunja.io/api 2.6.0Fixed version · GitHub Advisories · go package code.vikunja.io/api: upgrade to 2.6.0 or later (affected >= 1.0.0, <= 2.5.0)

[ Packages ]Affected open-source packages

[ References ]References