---
id: CVE-2026-121531
title: Umami 2FA Policy route.ts single-factor authentication
summary: >-
  A vulnerability has been found in Umami 3.3.x/3.4.0/3.4.1. This affects an
  unknown part of the file src/app/api/auth/login/route.ts of the component 2FA
  Policy Handler. The manipulation leads to use of single-factor authentication.
  It is…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C'
cvssSource: cna
cwe:
  - CWE-308
  - CWE-287
product: Umami
affected:
  - Umami 3.3.*
  - Umami 3.4.0
  - Umami 3.4.1
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-03T22:38:12.855832Z'
exploitAvailable: true
published: '2026-11-03'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T22:39:05.145Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121531'
references:
  - url: 'https://vuldb.com/vuln/430290'
    label: VDB-430290 | Umami 2FA Policy route.ts single-factor authentication
  - url: 'https://vuldb.com/vuln/430290/cti'
    label: 'VDB-430290 | CTI Indicators (IOB, IOC, TTP, IOA)'
  - url: 'https://vuldb.com/cve/CVE-2026-121531'
    label: CVE-2026-121531 | CVE Analysis and Report
  - url: 'https://vuldb.com/submit/1019994'
    label: 'Submit #1019994 | umami-software umami 3.4.0 Improper Authentication'
  - url: 'https://github.com/waterhunter2000-svg/vulnerability-reports'
  - url: >-
      https://github.com/umami-software/umami/security/advisories/GHSA-29fx-pxjg-35rm
  - url: >-
      https://github.com/waterhunter2000-svg/vulnerability-reports/blob/main/03-umami-enforced-2fa-not-applied.md
tags:
  - cve.org
  - exploit-available
epss: 0.00349
epssPercentile: 0.28681
ingestedAt: '2026-11-05T20:33:06.599Z'
---

## Overview

A vulnerability has been found in Umami 3.3.x/3.4.0/3.4.1. This affects an unknown part of the file src/app/api/auth/login/route.ts of the component 2FA Policy Handler. The manipulation leads to use of single-factor authentication. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

## Affected

- `Umami 3.3.*`
- `Umami 3.4.0`
- `Umami 3.4.1`

## Remediation

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