---
id: GHSA-9xwc-vwww-qqmw
title: >-
  Duplicate Advisory: Vikunja: Link-share principal-type confusion enables
  cross-account team removal, bot takeover, and roster disclosure
summary: >-
  Duplicate Advisory: Vikunja: Link-share principal-type confusion enables
  cross-account team removal, bot takeover, and roster disclosure
severity: high
cvss: 7.5
cwe:
  - CWE-639
vendor: api
product: code.vikunja.io/api
ecosystem: go
affected:
  - code.vikunja.io/api <= 2.4.0
published: '2026-08-19'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T20:43:23Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-9xwc-vwww-qqmw'
references:
  - url: >-
      https://github.com/go-vikunja/vikunja/security/advisories/GHSA-32r8-5843-4qw2
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76216'
  - url: >-
      https://www.vulncheck.com/advisories/vikunja-through-principal-type-confusion-via-linksharing
  - url: 'https://github.com/advisories/GHSA-9xwc-vwww-qqmw'
tags:
  - ghsa
  - go
ingestedAt: '2026-10-09T21:12:42.333Z'
---

## Overview

### Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-32r8-5843-4qw2. This link is maintained to preserve external references.

### Original 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.

## Affected packages

- `code.vikunja.io/api <= 2.4.0`

## Remediation

Refer to the advisory for the patched release.