CVE-2026-45284 PUBLISHED

Nextcloud: Wrong condition in the User OIDC app's LdapService allowed deleted LDAP users to authenticate

Assigner: GitHub_M
Reserved: 11.05.2026 Published: 01.06.2026 Updated: 02.06.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
CVSS Score: 4.6

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	Low
User Interaction	Required	Availability Impact	Low

CVSS 3.1

Product Status

Vendor	nextcloud
Product	security-advisories
Versions	Version >= 1.3.6, < 8.4.0 is affected

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-79xf-ffj8-96fm
https://github.com/nextcloud/user_oidc/pull/1340
https://hackerone.com/reports/3554696

Problem Types

CWE-284: Improper Access Control CWE