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CVE

CWE

Training

CVE-2026-45286

Published: Jun 1, 2026

Modified: Jun 1, 2026

PUBLISHED

CVSS v3.1

4.3

MEDIUM

Description

Nextcloud is an open source content collaboration platform. From versions 5.5.13 to before 5.5.17, and 6.2.0 to before 6.2.3, an authenticated user can enumerate users on the same Nextcloud instance by using the Calendar app's endpoint for suggesting attendees. The sharing restrictions, applied to other endpoints, were not effective here. This issue has been patched in versions 5.5.17 and 6.2.3.

Vendor	Product	Versions
nextcloud	security-advisories	affected `>= 5.5.13, < 5.5.17` affected `>= 6.2.0, < 6.2.3`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r697-74m9-gvf2

x_refsource_CONFIRM

https://github.com/nextcloud/calendar/issues/7971

x_refsource_MISC

https://github.com/nextcloud/calendar/pull/8197

x_refsource_MISC

https://hackerone.com/reports/3540663

x_refsource_MISC

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