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

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Summary

CVECVE-2026-45284
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-01 19:16:50 UTC
Updated2026-06-03 20:28:42 UTC
DescriptionNextcloud 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

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

EPSS: 0.000190000 probability, percentile 0.052670000 (date 2026-06-08)

Problem Types: CWE-284 | NVD-CWE-noinfo | CWE-284 CWE-284: Improper Access Control

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary4.6MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
3.1CNADECLARED4.6MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Nextcloud User Oidc All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nextcloud Security-advisories affected >= 1.3.6, < 8.4.0 Not specified

References

ReferenceSourceLinkTags
hackerone.com/reports/3554696 [email protected] hackerone.com Permissions Required
github.com/nextcloud/security-advisories/security/advisories/GHSA-79xf-f... [email protected] github.com Mitigation, Vendor Advisory
github.com/nextcloud/user_oidc/pull/1340 [email protected] github.com Issue Tracking, Patch
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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