CVE-2026-76216

High

Description

Vikunja through 2.4.0 contains a principal-type confusion vulnerability where LinkSharing principals with id N are treated as user principals with users.id == N at three permission checks lacking type guards. Attackers with a link-share JWT can remove victims from teams, enumerate and delete victim bot users, or read team rosters by exploiting id collisions in the autoincrement space.

SeverityHigh

CVSS7.5

Exploit probability—

ProductCode.vikunja.io/api

PublishedAug 19, 2026

First seenAug 19, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

code.vikunja.io/api2.5.0 or later

Vendor advisories

github.com/go-vikunja/vikunja/security/advisories/GHSA-32r8-5843-4qw2

Affected products

Product	Affected versions	Fixed in
code.vikunja.io/apiGo	v < 2.5.0, No range specified	2.5.0

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