CVE-2026-111918

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

State: Published
Severity: 5.3 Medium
Published: Oct 17, 2026
Updated: Oct 19, 2026
Reserved: Oct 17, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N	VulnCheck
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L	VulnCheck

Weaknesses

CWE-863 Incorrect Authorization

Affected Products

Product	Versions
vikunjago-vikunja	1.0.0-rc0 to before 2.7.0Affected 2.7.0Not affected

References

GitHub Security Advisory (GHSA-fprf-r6rv-xg99)vendor-advisory
VulnCheck Advisory: Vikunja 1.0.0-rc0 before 2.7.0 Cross-Tenant Task Position Writes via Saved Filter Creationthird-party-advisory

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