CVE-2026-111918 Vikunja 1.0.0-rc0 before 2.7.0 Cross-Tenant Task Position Writes via Saved Filter Creation
Authenticated users can write task positions across all tenants, enabling cross-tenant data modification and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-111918?
CVE-2026-111918 is a medium-severity missing authorization vulnerability in go-vikunja vikunja, published on 17 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-111918?
3 open source packages ship an affected version, including code.vikunja.io/api.
| Package | Affected | Fixed in |
|---|---|---|
code.vikunja.io/api Go | All versions | None |
code.vikunja.io/api Go | From 1.0.0-rc0 | 2.7.0 |
code.vikunja.io/api Go | From 1.0.0-rc0 | 2.7.0 |
How do I fix CVE-2026-111918?
Upgrade code.vikunja.io/api to 2.7.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-111918 being exploited?
There is no known exploitation of CVE-2026-111918 in the wild and no public exploit code.
Sources
Also known as GHSA-fprf-r6rv-xg99, GHSA-mjqg-gwhm-xr66, GO-2026-6731.