---
id: CVE-2026-123526
title: Vikunja before 2.7.1 Mass Assignment via Team external_id Field
summary: >-
  Vikunja before 2.7.1 contains a mass assignment vulnerability that allows any
  authenticated user to set the read-only external_id field through the team
  create and update endpoints. Attackers can tag a team they create or
  administer as e…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L'
cvssSource: cna
cwe:
  - CWE-915
vendor: go-vikunja
product: vikunja
affected:
  - vikunja < 2.7.1
published: '2026-11-08'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T01:37:35.608Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-123526'
references:
  - url: >-
      https://github.com/go-vikunja/vikunja/security/advisories/GHSA-fjrf-gjmg-9v6g
    label: GitHub Security Advisory (GHSA-fjrf-gjmg-9v6g)
  - url: >-
      https://www.vulncheck.com/advisories/vikunja-before-2.7.1-mass-assignment-via-team-external-id-field
    label: >-
      VulnCheck Advisory: Vikunja before 2.7.1 Mass Assignment via Team
      external_id Field
tags:
  - cve.org
ingestedAt: '2026-11-08T02:43:18.687Z'
---

## Overview

Vikunja before 2.7.1 contains a mass assignment vulnerability that allows any authenticated user to set the read-only external_id field through the team create and update endpoints. Attackers can tag a team they create or administer as externally managed, permanently blocking removal of every member and causing SSO members to be dropped from the team at their next login.

## Affected

- `vikunja < 2.7.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.