Medium 4.3Published Jun 1, 2026

CVE-2026-45286Nextcloud is an open source content collaboration platform.

Updated under an hour ago (2026-10-19 06:50 UTC)

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It affects nextcloud calendar. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for nextcloud calendar

Exploited in the last 30 days

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.

CVSS: 4.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-200
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jul 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

nextcloud calendar nextcloud:calendar	from 5.5.13 before 5.5.17; from 6.2.0 before 6.2.3	NVD

References

https://github.com/nextcloud/calendar/issues/7971exploit, issue-tracking, patch
https://github.com/nextcloud/calendar/pull/8197issue-tracking, patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r697-74m9-gvf2mitigation, vendor-advisory
https://hackerone.com/reports/3540663permissions-required

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.