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Nextcloud CVE-2025-66548

| EUVD-2025-201466 LOW
Improper Encoding or Escaping of Output (CWE-116)
2025-12-05 security-advisories@github.com
Information Disclosure Nextcloud
3.3
CVSS 3.1

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

4
EUVD ID Assigned
Mar 15, 2026 - 17:08 euvd
EUVD-2025-201466
Analysis Generated
Mar 15, 2026 - 17:08 vuln.today
Patch released
Mar 15, 2026 - 17:08 nvd
Patch available
CVE Published
Dec 05, 2025 - 18:15 nvd
LOW 3.3

DescriptionNVD

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.

Analysis

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.

Technical ContextAI

This vulnerability is classified as Improper Encoding or Escaping of Output (CWE-116).

RemediationAI

A vendor patch is available. Apply it as soon as possible and verify the fix.

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CVE-2025-66548 vulnerability details – vuln.today
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