PT-2026-45535 · Nextcloud · Security-Advisories

Côme Chilliet + 1 · Published 2026-06-01 · Updated 2026-06-01 · CVE-2026-45691

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, 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

Fix

Improper Authentication

Weakness Enumeration

CWE-287

Related Identifiers

CVE-2026-45691

Affected Products

Security-Advisories

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-45691 · Security Note
• https://github.com/nextcloud/server/pull/59758 · Note
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-mp6x-g55j-w9jw · Note
• https://hackerone.com/reports/3573399 · Note