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CVE-2026-45284

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

Published: Jun 1, 2026Updated: Jun 1, 2026 Sources: CVE List NVD
NVD MITRE
4.6CVSS
MEDIUM

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:HPR:LUI:RS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low

Weaknesses

CWE-284

Affected Products

security-advisories
nextcloud

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

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

Timeline

Published
Jun 1, 2026
Last Updated
Jun 1, 2026

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