CVE-2026-45156

Published: Jun 1, 2026Modified: Jul 22, 2026Deferred

8.1

Vector

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

Exploitability: 2.8 / Impact: 5.2

Source: security-advisories@github.com (Secondary)

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.

Related CWEs

CWE-287

Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

References (3)

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qqgv-fqwp-mjpp

Source: security-advisories@github.com

https://github.com/nextcloud/user_oidc/pull/1285

Source: security-advisories@github.com

https://hackerone.com/reports/3489490

Source: security-advisories@github.com

Timeline

No history available yet.