CVE-2023-39963: Nextcloud Server

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 20.0.0 and prior to versions 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.8, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1, a missing password confirmation allowed an attacker, after successfully stealing a session from a logged in user, to create app passwords for the victim. Nextcloud server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. No known workarounds are available.

Affected products

• Nextcloud Nextcloud Server: from 20.0.0, before 20.0.14.15 (fixed in 20.0.14.15); from 21.0.0, before 21.0.9.13 (fixed in 21.0.9.13); from 22.0.0, before 22.2.10.14 (fixed in 22.2.10.14); from 23.0.0, before 23.0.12.9 (fixed in 23.0.12.9); from 24.0.0, before 24.0.12.5 (fixed in 24.0.12.5); from 25.0.0, before 25.0.9 (fixed in 25.0.9); …

Published 2023-08-10. Last modified 2026-06-17.