vulnerability / NVI-00009036 / Revision 1
Vikunja: Saved filter creation with an empty filter string recalculates task positions across all tenants
GitHub lists this reviewed advisory for code.vikunja.io/api. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
5.4 medium
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
code.vikunja.io/api
source listed>= 1.0.0-rc0, <= 2.6.0
### Summary In Vikunja v2.6.0 the task position recalculation that runs when a saved filter view is created fails open when the requesting user has no accessible projects. Instead of aborting, the search that feeds the recalculation loses its project scope entirely and returns every task in the instance. The server then writes one `task_positions` row per task per view (four views per filter) into views owned by the requesting user, including rows that reference tasks of other tenants the user can never see. Any authenticated user can trigger this. The impact is a cross-tenant integrity violation, a single-request write amplification primitive that scales with instance size, and a violation of the invariant stated in the fix for GHSA-w39f-h553-h2mx that position writes are scoped by project read access. ### Details Vikunja computes kanban and list ordering in a shared `task_positions` table keyed by `(task_id, project_view_id)`. When a saved filter is created, `SavedFilter.Create` (`pkg/models/saved_filters.go:130`) calls `CreateDefaultViewsForProject` (`pkg/models/project_view.go:816`) which, for every default view it creates, calls `RecalculateTaskPositions` with `addExistingT
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database
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Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
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- GHSA-fprf-r6rv-xg99 ↗
GitHub Advisory Database · vendor advisory
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Public revision history
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- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.