Access Control Flaw in Deck Config API Affects Product by Vendor
CVE-2026-77170

4.3MEDIUM

Key Information:

Vendor

Nextcloud
Status
Deck
Vendor
CVE Published:
18 September 2026

What is CVE-2026-77170?

The Deck config API has a critical access control vulnerability that permits authenticated users to modify board-scoped configuration keys for any arbitrary board ID. This occurs without proper validation of the user's ownership or permission to manage the specified board, potentially exposing sensitive configurations and leading to unauthorized changes.

Affected Version(s)

Deck 1.16.0 <= 1.18.0

References

https://hackerone.com/reports/3599383

CVSS V3.0

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Dang Hung Vi (vidang04)
.