---
id: CVE-2026-45690
title: Nextcloud is an open source content collaboration platform
summary: >-
  Nextcloud is an open source content collaboration platform. In Nextcloud
  Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, an
  authentication bypass vulnerability allowed attackers with knowledge of a
  user's passw…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N'
cwe:
  - CWE-287
vendor: nextcloud
product: nextcloud_server
affected:
  - 'nextcloud_server >= 32.0.0, < 32.0.9'
  - 'nextcloud_server >= 33.0.0, < 33.0.3'
  - 'nextcloud_server >= 29.0.0, < 29.0.16.16'
  - 'nextcloud_server >= 30.0.0, < 30.0.17.9'
  - 'nextcloud_server >= 31.0.0, < 31.0.14.5'
patched:
  - nextcloud_server 33.0.3
published: '2026-06-01'
updated: '2026-07-22'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-45690'
references:
  - url: >-
      https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jgcj-v42r-9922
    label: security-advisories@github.com
  - url: 'https://github.com/nextcloud/server/pull/59758'
    label: security-advisories@github.com
  - url: 'https://hackerone.com/reports/3639301'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.0029
epssPercentile: 0.21846
ingestedAt: '2026-07-23T07:14:46.551Z'
---

## Overview

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, an authentication bypass vulnerability allowed attackers with knowledge of a user's password to circumvent two-factor authentication (2FA) protections. When a user initiated login with valid credentials on a 2FA-enabled account, the system created a temporary session token before enforcing the second factor challenge. This token could be extracted and replayed via HTTP Basic Authentication to gain unauthorized access to authenticated endpoints. It is recommended that the Nextcloud Server is upgraded to 33.0.3 or 32.0.9. It is recommended that the Nextcloud Enterprise Server is upgraded to 33.0.3, 32.0.9, 31.0.14.5, 30.0.17.9 or 29.0.16.16

## Affected

- `nextcloud_server >= 32.0.0, < 32.0.9`
- `nextcloud_server >= 33.0.0, < 33.0.3`
- `nextcloud_server >= 29.0.0, < 29.0.16.16`
- `nextcloud_server >= 30.0.0, < 30.0.17.9`
- `nextcloud_server >= 31.0.0, < 31.0.14.5`

## Remediation

Upgrade past the affected range:

- `nextcloud_server 33.0.3`