---
id: GHSA-vcgv-7rvm-m3vp
title: >-
  Duplicate Advisory: Vikunja: Link-share token can enumerate users through the
  v2 API
summary: >-
  Duplicate Advisory: Vikunja: Link-share token can enumerate users through the
  v2 API
severity: medium
cvss: 4.3
cwe:
  - CWE-200
vendor: api
product: code.vikunja.io/api
ecosystem: go
affected:
  - code.vikunja.io/api <= 2.5.0
published: '2026-09-15'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T20:52:34Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-vcgv-7rvm-m3vp'
references:
  - url: >-
      https://github.com/go-vikunja/vikunja/security/advisories/GHSA-vfxw-3x8p-2vjr
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91981'
  - url: >-
      https://www.vulncheck.com/advisories/vikunja-before-2.6.0-user-enumeration-via-v2-api
  - url: 'https://github.com/advisories/GHSA-vcgv-7rvm-m3vp'
tags:
  - ghsa
  - go
ingestedAt: '2026-10-09T21:12:42.328Z'
---

## Overview

### Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-vfxw-3x8p-2vjr. This link is maintained to preserve external references.

### Original Description
Vikunja versions before 2.6.0 fail to properly validate link-share tokens in the v2 API user search endpoints. Attackers with a read-only share link can enumerate project users via the projects endpoint and confirm arbitrary usernames exist via the global search endpoint.

## Affected packages

- `code.vikunja.io/api <= 2.5.0`

## Remediation

Refer to the advisory for the patched release.