CVE-2025-66548CWE-116

CVE-2025-66548

Low · published December 5, 2025

CVSS v3.1
3.3
EPSS
0%
Percentile
4.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
3.3 · LOW
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00154 · 4.2th percentile
Weakness
CWE-116 · Improper Encoding or Escaping of Output
Published
2025-12-05T23:15Z
Affected products (3)
ProductVersionsFixed in
nextcloud/deck< 1.12.71.12.7
nextcloud/deck≥ 1.14.0, < 1.14.41.14.4
nextcloud/deck≥ 1.15.0, < 1.15.11.15.1
References (4)
https://github.com/nextcloud/deck/pull/6671 · [email protected]https://github.com/nextcloud/deck/commit/afa95d3c507465b9d31af7c88c69b76711ef185a · [email protected]https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xjvq-xvr7-xpg6 · [email protected]https://hackerone.com/reports/2326618 · [email protected]
EPSS history
Timeline
  • 05 DEC 17:26Z
    Nextcloud Deck app allows to spoof file extensions by using RTLO characters
    cvelistv5