CVE-2025-66548

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.

CVSS v3.1 Score

3.3

LOW

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Weakness Type (CWE)

CWE-116 CWE-116

Affected Products

Vendor	Product	Versions
nextcloud	deck	< 1.12.7
nextcloud	deck	1.14.0 — 1.14.4
nextcloud	deck	1.15.0 — 1.15.1

References

Advisories & Patches

https://github.com/nextcloud/deck/commit/afa95d3c507465b9d31af7c88c69b76711ef185a https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xjvq-xvr7-xpg6 https://hackerone.com/reports/2326618

Other References

https://github.com/nextcloud/deck/pull/6671

Frequently Asked Questions

What is CVE-2025-66548? +

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. It has a CVSS v3.1 base score of 3.3 (LOW).

How severe is CVE-2025-66548? +

CVE-2025-66548 has a CVSS v3.1 score of 3.3 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

What products are affected by CVE-2025-66548? +

CVE-2025-66548 affects products from nextcloud, specifically: deck. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-66548? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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