CVE-2026-111920

Medium

Description

Vikunja 2.6.0 contains a broken access control flaw in getProjectAccessForUser (pkg/models/project_access.go), which resolves a user's effective project permission as the maximum over the project tree, silently overriding explicit lower-permission shares on sub-projects. A collaborator with write access on a parent project but read-only access to a child project can modify the child project's tasks and content.

SeverityMedium

CVSS4.3

Exploit probability—

ProductCode.vikunja.io/api

PublishedOct 17, 2026

First seenOct 17, 2026

Weakness typeCWE-269Improper privilege management

How to fix

Vendor advisories

github.com/go-vikunja/vikunja/security/advisories/GHSA-pjr3-86v4-5p7w

Affected products

Product	Affected versions	Fixed in
code.vikunja.io/apiGo	No range specified	—

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