All vulnerabilities
CVE-2026-111918GHSA-fprf-r6rv-xg99GO-2026-6731

Vikunja 1.0.0-rc0 before 2.7.0 Cross-Tenant Task Position Writes via Saved Filter Creation

go-vikunja vikunjaGoLibraries & packages
Open in ThreatlineRecord JSON
CVSS
5.3Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.18%Chance of exploitation activity in the next 30 days, higher than 6% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in2.7.0Fixed versionCVE List
Published17 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 3

  • vikunjaaffected: 1.0.0-rc0 before 2.7.0CVE List
  • vikunjaunaffected: 2.7.0CVE List
  • code.vikunja.io/api, Gofrom 1.0.0-rc0, through 2.6.0OSV

References 2