CVE-2026-45690

MEDIUM EPSS 20.7%
Published Jun 1, 20261mo ago · Modified Jun 17, 20262w ago
5.9 CVSS 3.1
Medium
Find Similar
Published Jun 1, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

Description

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

CVSS Details

Base Score
5.9
Exploitability
1.6
Impact
4.2
Vector string
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
Attack Vector Network
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
20.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-287 Improper Authentication Authentication

Affected Products 7

VendorProductVersionRange
nextcloudnextcloud_server*≥32.0.0  –  <32.0.9
nextcloudnextcloud_server*≥33.0.0  –  <33.0.3
nextcloudnextcloud_server*≥29.0.0  –  <29.0.16.16
nextcloudnextcloud_server*≥30.0.0  –  <30.0.17.9
nextcloudnextcloud_server*≥31.0.0  –  <31.0.14.5
nextcloudnextcloud_server*≥32.0.0  –  <32.0.9
nextcloudnextcloud_server*≥33.0.0  –  <33.0.3

References 3

  • github.com https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jgcj-v42r-9922
    Vendor Advisory
  • github.com https://github.com/nextcloud/server/pull/59758
    Issue TrackingPatch
  • hackerone.com https://hackerone.com/reports/3639301
    Permissions Required

Remediation

  • github.com https://github.com/nextcloud/server/pull/59758
    Issue TrackingPatch