What is CVE-2026-77165?

CVE-2026-77165 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 6.5/10. Published 2026-09-21.

How severe is CVE-2026-77165?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Nextcloud Server

CVE-2026-77165

File owners were unable to unlock TYPE_TOKEN locks placed by other users, leaving files permanently locked with no recovery path outside of the database.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Nextcloud Server

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

support@hackerone.com

Frequently asked questions

What is CVE-2026-77165?: CVE-2026-77165 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 6.5/10. Published 2026-09-21.
How severe is CVE-2026-77165?: Medium severity. CVSS v3 base score is 6.5 out of 10.