PT-2026-45528 · Nextcloud · Security-Advisories

Dorra Jaouad · Published 2026-06-01 · Updated 2026-06-01 · CVE-2026-45284

NVD

CVSS v3.1

4.6

Medium

Base vector

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

Nextcloud is an open source content collaboration platform. From version 1.3.6 to before version 8.4.0, an improper check allowed users that where provided by LDAP to still authenticate towards user OIDC after they where deleted. This issue has been patched in version 8.4.0.

Fix

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

CVE-2026-45284

Affected Products

Security-Advisories

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-45284 · Security Note
• https://github.com/nextcloud/user_oidc/pull/1340 · Note
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-79xf-ffj8-96fm · Note
• https://hackerone.com/reports/3554696 · Note