CVE-2026-45284

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

State: Published
Severity: 4.6 Medium
Published: Jun 1, 2026
Updated: Jun 2, 2026
Reserved: May 11, 2026

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.

Scores

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

Weaknesses

CWE-284 Improper Access Control

Affected Products

Product	Versions
security-advisoriesnextcloud	>= 1.3.6, < 8.4.0Affected

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

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