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    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.

    Published:Jun 1, 2026
    Last Modified:Jun 3, 2026
    EPS:Jun 1, 2026
    EPSS Score:0.00029
    CVSS Score:4.6

    Affected Products

    Vendor
    Nextcloud
    Product
    User Oidc

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-284 Improper Access Control

    Related CVEs

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    CVE-2026-45156 (CVSS 8.1) — Nextcloud is an open source content collaboration platform. From versions 0.3.0 to before 3.1.0, 5.0.0 to befo…
    CVE-2024-52512 (CVSS 3.3) — user_oidc app is an OpenID Connect user backend for Nextcloud. A malicious user could send a malformed login l…
    CVE-2024-37886 (CVSS 5.4) — user_oidc app is an OpenID Connect user backend for Nextcloud. An attacker could potentially trick the app int…
    CVE-2024-37312 (CVSS 6.3) — user_oidc app is an OpenID Connect user backend for Nextcloud. Missing access control on the ID4me endpoint al…
    CVE-2023-39954 (CVSS 3.8) — user_oidc provides the OIDC connect user backend for Nextcloud, an open-source cloud platform. Starting in ver…
    CVE-2023-39953 (CVSS 4.8) — user_oidc provides the OIDC connect user backend for Nextcloud, an open-source cloud platform. Starting in ver…
    CVE-2023-32074 (CVSS 8) — user_oidc app is an OpenID Connect user backend for Nextcloud. Authentication can be broken/bypassed in user_o…
    CVE-2023-28848 (CVSS 4.8) — user_oidc is the OIDC connect user backend for Nextcloud, an open source collaboration platform. A vulnerabili…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High