CVE-2026-77170 Missing authorization in Deck
Authenticated users can modify configuration settings for boards they do not own or manage due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-77170?
CVE-2026-77170 is a medium-severity missing authorization vulnerability in Nextcloud Deck, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-284
Which versions are affected by CVE-2026-77170?
How do I fix CVE-2026-77170?
No fix has been published for CVE-2026-77170 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-77170 being exploited?
There is no known exploitation of CVE-2026-77170 in the wild and no public exploit code.
Sources
Also known as GHSA-c82v-5g56-99px.