PT-2026-45534 · Nextcloud · Security-Advisories

Dorra Jaouad + 1 · Published 2026-06-01 · Updated 2026-06-01 · CVE-2026-45690

NVD

CVSS v3.1

5.9

Medium

Base vector

AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N

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

Fix

Improper Authentication

Weakness Enumeration

CWE-287

Related Identifiers

CVE-2026-45690

Affected Products

Security-Advisories

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-45690 · Security Note
• https://github.com/nextcloud/server/pull/59758 · Note
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jgcj-v42r-9922 · Note
• https://hackerone.com/reports/3639301 · Note