CVE-2026-45278: Nextcloud User Oidc

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Nextcloud is an open source content collaboration platform. From version 6.1.0 to before version 8.2.2, an attacker can craft links that would redirect users to another website, when the victim uses the attackers link to log in via user OIDC. This issue has been patched in version 8.2.2.

Affected products

• Nextcloud User Oidc: from 6.1.0, before 8.2.2 (fixed in 8.2.2)

Published 2026-06-01. Last modified 2026-07-20.