CVE-2026-91984

MEDIUM 4.3

Vikunja before 2.6.0 Broken Object-Level Authorization via task-position

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

Vikunja before 2.6.0 fails to validate that user-supplied project_view_id in task-position requests belongs to the task's project. Authenticated attackers can insert task position rows into arbitrary other tenant project views via POST or PUT task-position endpoints.

CWE	CWE-639
Vendor	go-vikunja
Product	vikunja
Published	Sep 15, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

go-vikunja / vikunja

0 < 2.6.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/go-vikunja/vikunja/security/advisories/GHSA-w39f-h553-h2mx vulncheck.com: https://www.vulncheck.com/advisories/vikunja-before-2.6.0-broken-object-level-authorization-via-task-position

Credits

🔍 ybsun0215 🔍 JellowBeanz26