---
id: CVE-2026-45691
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, a
  pre-2FA session cookie (created after successful password authentication but
  before TOT…
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-2026-45691'
references:
  - url: >-
      https://github.com/nextcloud/security-advisories/security/advisories/GHSA-mp6x-g55j-w9jw
    label: security-advisories@github.com
  - url: 'https://github.com/nextcloud/server/pull/59758'
    label: security-advisories@github.com
  - url: 'https://hackerone.com/reports/3573399'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00433
epssPercentile: 0.34927
ingestedAt: '2026-07-23T07:14:46.577Z'
---

## 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, a pre-2FA session cookie (created after successful password authentication but before TOTP completion) could be reused as a Bearer token to authenticate against DAV endpoints, granting read/write access and bypassing mandatory two-factor authentication. 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`