Vulnerability · Published Dec 5, 2025 · Assigned by GitHub_M
CVE-2025-66557Nextcloud Deck app allowed user with "Can share" permission to modify permissions of other non-owners
Medium 5.4
In plain English
A medium-severity improper access control in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.3%top 77.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.14.6 and 1.15.2, a bug in the permission logic allowed users with "Can share" permission to modify the permissions of other recipients. This vulnerability is fixed in 1.14.6 and 1.15.2.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nextcloud | security-advisories | >= 1.15.0-beta.1, < 1.15.2< 1.14.6 |
Weakness: CWE-284 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-wwr8-hx9g-rjvv x_refsource_CONFIRM
- https://github.com/nextcloud/deck/pull/7131 x_refsource_MISC
- https://github.com/nextcloud/deck/commit/f1da8b30a455f02373d44154da04494c949a95ae x_refsource_MISC
- https://hackerone.com/reports/3247499 x_refsource_MISC