CVE-2025-66548
Nextcloud Deck app allows to spoof file extensions by using RTLO characters
Description
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.
INFO
Published Date :
Dec. 5, 2025, 6:15 p.m.
Last Modified :
Dec. 9, 2025, 7:01 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | LOW | [email protected] | ||||
| CVSS 3.1 | LOW | MITRE-CVE | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Nextcloud Deck to 1.12.7 or later.
- Update Nextcloud Deck to 1.14.4 or later.
- Update Nextcloud Deck to 1.15.1 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-66548.
| URL | Resource |
|---|---|
| https://github.com/nextcloud/deck/commit/afa95d3c507465b9d31af7c88c69b76711ef185a | Patch |
| https://github.com/nextcloud/deck/pull/6671 | Issue Tracking |
| https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xjvq-xvr7-xpg6 | Patch Vendor Advisory |
| https://hackerone.com/reports/2326618 | Permissions Required Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-66548 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-66548
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-66548 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-66548 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Dec. 09, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Added CPE Configuration OR *cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:* versions up to (excluding) 1.12.7 *cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:* versions from (including) 1.14.0 up to (excluding) 1.14.4 *cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:* versions from (including) 1.15.0 up to (excluding) 1.15.1 Added Reference Type GitHub, Inc.: https://github.com/nextcloud/deck/commit/afa95d3c507465b9d31af7c88c69b76711ef185a Types: Patch Added Reference Type GitHub, Inc.: https://github.com/nextcloud/deck/pull/6671 Types: Issue Tracking Added Reference Type GitHub, Inc.: https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xjvq-xvr7-xpg6 Types: Patch, Vendor Advisory Added Reference Type GitHub, Inc.: https://hackerone.com/reports/2326618 Types: Permissions Required, Vendor Advisory -
New CVE Received by [email protected]
Dec. 05, 2025
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Added CWE CWE-116 Added Reference https://github.com/nextcloud/deck/commit/afa95d3c507465b9d31af7c88c69b76711ef185a Added Reference https://github.com/nextcloud/deck/pull/6671 Added Reference https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xjvq-xvr7-xpg6 Added Reference https://hackerone.com/reports/2326618