CVE-2026-45156

HIGH EPSS 24.7%
Published Jun 1, 20264w ago · Modified Jun 17, 20261w ago
8.1 CVSS 3.1
High
Find Similar
Published Jun 1, 2026 4w ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
8.1
Exploitability
2.8
Impact
5.2
Vector string
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

Threat Intelligence

EPSS Exploit Probability
24.7% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-287 Improper Authentication Authentication

References 3

  • github.com https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qqgv-fqwp-mjpp
  • github.com https://github.com/nextcloud/user_oidc/pull/1285
  • hackerone.com https://hackerone.com/reports/3489490

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.