---
id: GHSA-phph-c358-5mwm
title: >-
  Duplicate Advisory: Vikunja: API token scopes bypassed via task expand
  parameter (comments, reactions, time entry counts)
summary: >-
  Duplicate Advisory: Vikunja: API token scopes bypassed via task expand
  parameter (comments, reactions, time entry counts)
severity: medium
cvss: 4.3
cwe:
  - CWE-863
vendor: api
product: code.vikunja.io/api
ecosystem: go
affected:
  - 'code.vikunja.io/api >= 1.0.0, <= 2.5.0'
published: '2026-09-15'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T20:51:47Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-phph-c358-5mwm'
references:
  - url: >-
      https://github.com/go-vikunja/vikunja/security/advisories/GHSA-9rg3-v78m-26q8
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91983'
  - url: >-
      https://www.vulncheck.com/advisories/vikunja-before-2.6.0-api-token-scope-bypass-via-expand-parameter
  - url: 'https://github.com/advisories/GHSA-phph-c358-5mwm'
tags:
  - ghsa
  - go
ingestedAt: '2026-10-09T21:12:42.330Z'
---

## Overview

### Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-9rg3-v78m-26q8. This link is maintained to preserve external references.

### Original Description
Vikunja before 2.6.0 contains an API token scope bypass vulnerability in task read endpoints where authorization fails to inspect query string parameters. Attackers with limited token scopes can use the expand parameter to access restricted data like comments, reactions, and time entries without proper permission verification.

## Affected packages

- `code.vikunja.io/api >= 1.0.0, <= 2.5.0`

## Remediation

Refer to the advisory for the patched release.