CVE-2026-91984

Medium

Description

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.

SeverityMedium

CVSS4.3

Exploit probability—

ProductCode.vikunja.io/api

PublishedSep 15, 2026

First seenSep 15, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

code.vikunja.io/api2.6.0 or later

Vendor advisories

github.com/go-vikunja/vikunja/security/advisories/GHSA-w39f-h553-h2mx

Affected products

Product	Affected versions	Fixed in
code.vikunja.io/apiGo	v < 2.6.0, No range specified	2.6.0

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