Quick answers
- Is CVE-2026-77170 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-77170 being exploited in the wild.
- How severe is CVE-2026-77170?
- Medium severity, with a CVSS score of 4.3, published 18 September 2026.
- Which products and versions are affected?
- Nextcloud Deck.
- Is there a fix for CVE-2026-77170?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-77170 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-77170?
- Check whether you run Nextcloud Deck. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The Deck config API endpoint lacks proper authorization validation when setting board-scoped configuration keys. An authenticated attacker can specify arbitrary board IDs in API requests and modify configuration parameters without the system verifying the attacker's ownership or management permissions on the target board. The vulnerability requires authentication but allows an authenticated user to escalate privileges within the application by manipulating boards they do not own. Patches are expected from the Nextcloud security team.
Affected products
- Nextcloud Deck
Timeline
- 2026-09-18: disclosed
- other: CVE-2026-77170 assigned