Vulnerability Report

CVE-2026-45284

Title: LDAP user OIDC authentication bypass

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-45284.

CWE Category CWE-284
Published Date Jun 01, 2026
Modified Date Jun 03, 2026
Exploit Status Not Found
Score 4.6 CVSS v3.1
Exploit Probability (EPSS)
0.02%

Vulnerability Summary

CVE-2026-45284: 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.

Impacted Vendors

N
nextcloud 1

Reference Links

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
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
4.6
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
REQUIRED
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
CVSS v3.1
Source Entity [email protected]
Severity HIGH
8.8
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-45284 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity HIGH
Privileges N/A
Interaction REQUIRED
CVSS Vector String CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L

Affected Stack

No specific products linked.