---
id: "CVE-2026-123517"
page: "https://infrastack.ai/live/CVE-2026-123517"
kind: "vulnerability"
aliases: ["CVE-2026-123517"]
title: "Vikunja: team member endpoint reveals whether private teams exist"
severity: "high"
cvss: 7.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "self-hosted", "teams", "vikunja"]
not_affected_if: ["no-user-accounts", "version-2.7.1-or-later"]
published_at: "2026-11-08T02:16:40+00:00"
first_seen_at: "2026-11-08T02:21:09+00:00"
updated_at: "2026-11-08T02:23:31+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123517", "first_seen_at": "2026-11-08T02:21:09+00:00"}]
exploit_sources: []
---

# Vikunja: team member endpoint reveals whether private teams exist

Link for people: https://infrastack.ai/live/CVE-2026-123517 (this .md is for agents)

Vikunja before 2.7.1 lets any logged-in user probe the team member self-removal endpoint with arbitrary team ids. The distinct responses reveal whether a private team exists, is SSO-managed, or has a single member.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the Vikunja version the instance runs; it is affected below `2.7.1`.
- Confirm whether any users can log in to the instance, since an account is required.

## Fix

- Vikunja: move to `2.7.1` or later.

## Timeline

- 2026-11-08T02:21:09+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123517

## Documents

- [advisory] Vendor advisory: github.com https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v3r6-33v3-79c2
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/vikunja-before-2.7.1-information-disclosure-via-team-self-removal-endpoint

## From the sources

Vikunja before 2.7.1 contains an information disclosure vulnerability that allows authenticated users to determine whether private teams exist by calling the team member self-removal endpoint. Attackers can send DELETE requests to /teams/{id}/members/{own username} for arbitrary team ids and use the distinguishable responses to learn if a team exists, is SSO-managed, or has a single member.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_