Description
Vikunja from 1.0.0-rc0 before 2.7.0 contains an improper authorization vulnerability in RecalculateTaskPositions that allows authenticated users with zero accessible projects to write task_positions rows for all tasks instance-wide. Attackers can delete their Inbox after repointing default_project_id, then create empty-filter saved filters to persist cross-tenant references and amplify writes for denial of service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| go-vikunja | vikunja | 1.0.0-rc0 – < 2.7.0 | 2.7.0 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | code.vikunja.io/api | >= 1.0.0-rc0, < 2.7.0 | 2.7.0 | GHSA-fprf-r6rv-xg99 |
| Go | code.vikunja.io/api | all versions | — | GO-2026-6731 |