Nextcloud Deck

Nextcloud Deck Privilege Escalation via Permission Logic bug (cve-2025-66557)
CVE-2025-66557 5.4 - Medium - December 05, 2025

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.

Authorization

Nextcloud Deck file extension spoofing via RTLO (before 1.12.7/1.14.4/1.15.1)
CVE-2025-66548 3.3 - Low - December 05, 2025

Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.12.7, 1.14.4, and 1.15.1, file extension can be spoofed by using RTLO characters, tricking users into download files with a different extension than what is displayed. This vulnerability is fixed in 1.12.7, 1.14.4, and 1.15.1.

Output Sanitization

Nextcloud Deck: Exposed Deleted Card Data in <1.6.6 (and later branches)
CVE-2024-37883 4.3 - Medium - June 14, 2024

Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. A user with access to a deck board was able to access comments and attachments of already deleted cards. It is recommended that the Nextcloud Deck app is upgraded to 1.6.6 or 1.7.5 or 1.8.7 or 1.9.6 or 1.11.3 or 1.12.1.

XSS via HTML in comments in Nextcloud Deck before 1.11.2
CVE-2024-22213 5.4 - Medium - January 18, 2024

Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. In affected versions users could be tricked into executing malicious code that would execute in their browser via HTML sent as a comment. It is recommended that the Nextcloud Deck is upgraded to version 1.9.5 or 1.11.2. There are no known workarounds for this vulnerability.

XSS

Nextcloud Deck 1.6/1.7/1.8 Access Control Bypass Delete Attachments
CVE-2023-22471 4.3 - Medium - January 14, 2023

Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Broken access control allows a user to delete attachments of other users. There are currently no known workarounds. It is recommended that the Nextcloud Deck app is upgraded to 1.6.5 or 1.7.3 or 1.8.2.

Insecure Direct Object Reference / IDOR

DoS via DB error in Nextcloud Deck (pre-1.6.5, 1.7.3, 1.8.2)
CVE-2023-22470 6.5 - Medium - January 14, 2023

Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. A database error can be generated potentially causing a DoS when performed multiple times. There are currently no known workarounds. It is recommended that the Nextcloud Server is upgraded to 1.6.5 or 1.7.3 or 1.8.2.

Improper Input Validation

Unauthorized Access in Nextcloud Deck < 1.8.2
CVE-2023-22469 3.5 - Low - January 10, 2023

Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. When getting the reference preview for Deck cards the user has no access to, unauthorized user could eventually get the cached data of a user that has access. There are currently no known workarounds. It is recommended that the Nextcloud app Deck is upgraded to 1.8.2.

Insecure Storage of Sensitive Information

Nextcloud Deck is a Kanban-style project & personal management tool for Nextcloud
CVE-2022-29159 4.3 - Medium - May 20, 2022

Nextcloud Deck is a Kanban-style project & personal management tool for Nextcloud. In versions prior to 1.4.8, 1.5.6, and 1.6.1, an authenticated user can move stacks with cards from their own board to a board of another user. The Nextcloud Deck app contains a patch for this issue in versions 1.4.8, 1.5.6, and 1.6.1. There are no known currently-known workarounds available.

Insecure Direct Object Reference / IDOR

Nextcloud Deck is a Kanban-style project & personal management tool for Nextcloud, similar to Trello
CVE-2022-24906 4.3 - Medium - May 20, 2022

Nextcloud Deck is a Kanban-style project & personal management tool for Nextcloud, similar to Trello. The full path of the application is exposed to unauthorized users. It is recommended that the Nextcloud Deck app is upgraded to 1.2.11, 1.4.6, or 1.5.4. There is no workaround available.

Generation of Error Message Containing Sensitive Information

Nextcloud is an open-source, self-hosted productivity platform
CVE-2021-39225 8.1 - High - October 25, 2021

Nextcloud is an open-source, self-hosted productivity platform. A missing permission check in Nextcloud Deck before 1.2.9, 1.4.5 and 1.5.3 allows another authenticated users to access Deck cards of another user. It is recommended that the Nextcloud Deck App is upgraded to 1.2.9, 1.4.5 or 1.5.3. There are no known workarounds aside from upgrading.

AuthZ

Deck is an open source kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud
CVE-2021-37631 6.5 - Medium - September 07, 2021

Deck is an open source kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. In affected versions the Deck application didn't properly check membership of users in a Circle. This allowed other users in the instance to gain access to boards that have been shared with a Circle, even if the user was not a member of the circle. It is recommended that Nextcloud Deck is upgraded to 1.5.1, 1.4.4 or 1.2.9. If you are unable to update it is advised to disable the Deck plugin.

Insecure Direct Object Reference / IDOR

Nextcloud Deck before 1.2.7, 1.4.1 suffers
CVE-2021-22913 6.5 - Medium - June 11, 2021

Nextcloud Deck before 1.2.7, 1.4.1 suffers from an information disclosure vulnerability when searches for sharees utilize the lookup server by default instead of only the local Nextcloud server unless a global search has been explicitly chosen by the user.

Information Disclosure

Nextcloud Deck before 1.0.2 suffers from an insecure direct object reference (IDOR) vulnerability
CVE-2020-8297 - February 23, 2021

Nextcloud Deck before 1.0.2 suffers from an insecure direct object reference (IDOR) vulnerability that permits users with a duplicate user identifier to access deck data of a previous deleted user.

Insecure Direct Object Reference / IDOR

Missing access control in Nextcloud Deck 1.0.4 caused an insecure direct object reference
CVE-2020-8235 - October 05, 2020

Missing access control in Nextcloud Deck 1.0.4 caused an insecure direct object reference allowing an attacker to view all attachments.

Insecure Direct Object Reference / IDOR

Improper access control in Nextcloud Deck 0.8.0
CVE-2020-8182 - October 05, 2020

Improper access control in Nextcloud Deck 0.8.0 allowed an attacker to reshare boards shared with them with more permissions than they had themselves.

Authorization

Improper access control in Nextcloud Deck 1.0.0
CVE-2020-8179 - July 02, 2020

Improper access control in Nextcloud Deck 1.0.0 allowed an attacker to inject tasks into other users decks.

Authorization

Improper neutralization of file names
CVE-2019-15619 4.8 - Medium - February 04, 2020

Improper neutralization of file names, conversation names and board names in Nextcloud Server 16.0.3, Nextcloud Talk 6.0.3 and Nextcloud Deck 0.6.5 causes an XSS when linking them with each others in a project.

XSS