CVE-2026-111921: Vikunja 0.13.0 before 2.7.0 Incorrect Authorization in Link Share Deletion

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-17 · updated 2026-10-21
Weakness: CWE-863

Description

Vikunja 0.13.0 before 2.7.0 contains an incorrect authorization vulnerability that allows project members with Write permission to delete admin-tier link shares because the delete permission check reads an unloaded share object. Attackers can send DELETE requests to the v1 or v2 projects shares endpoints with sequential share IDs to revoke admin links and invalidate existing share sessions.

Affected products

Go Code.Vikunja.Io/Api: from 0.13.0 before 2.7.0 — fixed in 2.7.0
go-vikunja vikunja: from 0.13.0 before 2.7.0 — fixed in 2.7.0

How to fix

Upgrade to a fixed version: Go Code.Vikunja.Io/Api 2.7.0; go-vikunja vikunja 2.7.0. Check the vendor advisory for mitigations.

References

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