What is CVE-2026-77170?

CVE-2026-77170 is a medium-severity vulnerability in Nextcloud Deck, classified under Improper Access Control. CVSS score: 4.3/10. Published 2026-09-18.

How severe is CVE-2026-77170?

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

Vulnerability in Nextcloud Deck

CVE-2026-77170

The Deck config API allows authenticated users to set board-scoped configuration keys for arbitrary board IDs without validating whether the user owns or has permission to manage the referenced board.

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:N/I:L/A:N.

Affected products

Nextcloud Deck

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

support@hackerone.com

Frequently asked questions

What is CVE-2026-77170?: CVE-2026-77170 is a medium-severity vulnerability in Nextcloud Deck, classified under Improper Access Control. CVSS score: 4.3/10. Published 2026-09-18.
How severe is CVE-2026-77170?: Medium severity. CVSS v3 base score is 4.3 out of 10.