---
id: CVE-2025-21618
aliases:
  - GHSA-v6jv-p6r8-j78w
  - PYSEC-2026-1705
title: NiceGUI On Air authentication issue
summary: NiceGUI On Air authentication issue
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'
vendor: nicegui
product: nicegui
ecosystem: pip
affected:
  - nicegui < 2.9.1
patched:
  - nicegui 2.9.1
published: '2025-01-06'
updated: '2026-07-07'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-v6jv-p6r8-j78w'
references:
  - url: >-
      https://github.com/zauberzeug/nicegui/security/advisories/GHSA-v6jv-p6r8-j78w
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-21618'
  - url: >-
      https://github.com/zauberzeug/nicegui/commit/1621a4ba6a06676b8094362d36623551e651adc1
  - url: 'https://github.com/zauberzeug/nicegui'
tags:
  - osv
  - pip
epss: 0.00382
epssPercentile: 0.29434
ingestedAt: '2026-07-08T18:25:53.104Z'
---

## Overview

### Summary
Once a user logins to one browser, all other browsers are logged in without entering password. Even incognito mode.

### Impact
high

## Affected packages

- `nicegui < 2.9.1`

## Remediation

Upgrade to a patched release:

- `nicegui 2.9.1`