What is CVE-2026-82984?

CVE-2026-82984 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 4.3/10. Published 2026-10-27.

How severe is CVE-2026-82984?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Nextcloud Server

CVE-2026-82984

When a team was configured as "visible to everyone", the web UI correctly blocked non-members from viewing the team ("You are not a member of ..."), but the resources API endpoint could still be called directly, allowing any authenticated non-member to enumerate the team's internal resources and their identifiers. This does not grant access to the contents of the discovered resources themselves, only their existence, names, and identifiers.

Published 2026-10-27.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Nextcloud Server

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

hackerone.com/reports/3511955

Frequently asked questions

What is CVE-2026-82984?: CVE-2026-82984 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 4.3/10. Published 2026-10-27.
How severe is CVE-2026-82984?: Medium severity. CVSS v3 base score is 4.3 out of 10.