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CVE-2026-45156

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CVE-2026-45156

Published: Jun 1, 2026

Modified: Jun 3, 2026

PUBLISHED

CVSS v3.1

8.1

HIGH

Description

Nextcloud is an open source content collaboration platform. From versions 0.3.0 to before 3.1.0, 5.0.0 to before 5.1.0, and 6.0.0 to before 6.4.0, a missing signature verification in User OIDC allowed a malicious ID4me authority to identify as any user. This issue has been patched in versions 3.1.0, 4.1.0, 5.1.0, 6.4.0 and 8.3.0.

VendorProductVersions

nextcloud

security-advisories

affected
>= 0.3.0, < 3.1.0
affected
>= 5.0.0, < 5.1.0
affected
>= 6.0.0, < 6.4.0

Weaknesses (CWE)

CWE-287

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

References

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