---
id: "CVE-2026-123521"
page: "https://infrastack.ai/live/CVE-2026-123521"
kind: "vulnerability"
aliases: ["CVE-2026-123521"]
title: "Vikunja: missing rate limit lets session holders brute-force passwords and disable TOTP"
severity: "medium"
cvss: 6.0
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "self-hosted", "totp", "vikunja"]
not_affected_if: ["version-2.7.1-or-later"]
published_at: "2026-11-08T02:16:41+00:00"
first_seen_at: "2026-11-08T02:21:09+00:00"
updated_at: "2026-11-08T02:25:10+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123521", "first_seen_at": "2026-11-08T02:21:09+00:00"}]
exploit_sources: []
---

# Vikunja: missing rate limit lets session holders brute-force passwords and disable TOTP

Link for people: https://infrastack.ai/live/CVE-2026-123521 (this .md is for agents)

Vikunja, an open-source task manager, does not limit failed attempts on its re-authentication endpoint for disabling two-factor login (TOTP). An attacker holding a stolen session can guess the account password without lockout, then turn off TOTP and keep access to the account.

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

## How to check

- Check the Vikunja version with the server's version endpoint or the running image tag; compare it to `2.7.1`.
- Look for the `/user/settings/totp/disable` route in your deployed build's API.

## Fix

- Vikunja: upgrade to `2.7.1` or later.

## Timeline

- 2026-11-08T02:21:09+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123521

## Documents

- [advisory] Vendor advisory: github.com https://github.com/go-vikunja/vikunja/security/advisories/GHSA-49pj-52x6-8gpj
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/vikunja-before-2.7.1-password-brute-force-via-totp-disable-endpoint

## From the sources

Vikunja before 2.7.1 contains an improper restriction of excessive authentication attempts vulnerability that allows session holders to brute-force account passwords via unthrottled re-authentication endpoints. Attackers with a stolen session can guess the password via /user/settings/totp/disable without lockout, then disable TOTP without a code for persistent account takeover.

---

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