CVE-2026-45284

high

Description

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.

References

https://hackerone.com/reports/3554696

https://github.com/nextcloud/user_oidc/pull/1340

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-79xf-ffj8-96fm

Details

Source: Mitre, NVD

Published: 2026-06-01

Updated: 2026-06-03

Risk Information

CVSS v2

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 8.8

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.00029