CVE-2025-66548— Nextcloud Deck app allows to spoof file extensions by using RTLO characters
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I. Basic Information for CVE-2025-66548
Vulnerability Information
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Vulnerability Title
Nextcloud Deck app allows to spoof file extensions by using RTLO characters
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对输出编码和转义不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Deck 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Deck是Nextcloud开源的一个看板风格的组织工具。旨在为与 Nextcloud 集成的团队进行个人规划和项目组织。 Deck 1.12.7之前版本、1.14.4之前版本和1.15.1之前版本存在安全漏洞，该漏洞源于文件扩展名可被伪造，可能导致用户下载恶意文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| nextcloud | security-advisories | >= 1.15.0-beta.1, < 1.15.1 | - |
II. Public POCs for CVE-2025-66548
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · nextcloud · 2025-12-05 · 19 CVEs total
| CVE-2025-66551 | 6.3 MEDIUM | Nextcloud Tables is missing an ownership check which allows moving columns into tables of |
| CVE-2025-66550 | 5.7 MEDIUM | Nextcloud Calendar attachments of local files are offered to downloaded |
| CVE-2025-66512 | 5.4 MEDIUM | Nextcloud Server vulnerable to XSS in SVG images when opened outside of Nextcloud |
| CVE-2025-66557 | 5.4 MEDIUM | Nextcloud Deck app allowed user with "Can share" permission to modify permissions of other |
| CVE-2025-66511 | 4.8 MEDIUM | Nextcloud Calendar app used predictable proposal participant tokens |
| CVE-2025-66510 | 4.5 MEDIUM | Nextcloud Server Contacts Search allowed users to retrieve contact information of other us |
| CVE-2025-66553 | 4.3 MEDIUM | Nextcloud Tables app allowed users to view columns metadata information of any table |
| CVE-2025-66513 | 4.3 MEDIUM | Nextcloud Tables app share information not limited to relevant users |
| CVE-2025-66552 | 4.3 MEDIUM | Nextcloud Server admin_audit does not log all actions on files in groupfolders |
| CVE-2025-66547 | 4.3 MEDIUM | Nextcloud Server users can modify tags on files that do not belong to them |
| CVE-2025-66514 | 3.5 LOW | Nextcloud Mail stored HTML injection in subject text |
| CVE-2025-66545 | 3.5 LOW | Nextcloud Groupfolders users with read-only permissions for team folder can restore delete |
| CVE-2025-66554 | 3.5 LOW | Nextcloud Contacts vulnerable to Stored XSS in contacts app via organisation and title fie |
| CVE-2025-66556 | 3.5 LOW | Nextcloud talk allows participants to blindly delete poll drafts of other users by ID |
| CVE-2025-66546 | 3.3 LOW | Nextcloud Calendar app allowed booking appointments without the generated token |
| CVE-2025-66558 | 3.1 LOW | Nextcloud Twofactor WebAuthn app was updated based on public key |
| CVE-2025-66515 | 2.7 LOW | Nextcloud Approval app allows users to request approval for other users file |
| CVE-2025-66549 | 2.4 LOW | Nextcloud Desktop discloses information when attempting to lock a file inside a end-to-end |
IV. Related Vulnerabilities
Same product: security-advisories
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Kiteworks Core has an Unrestricted Upload of File with Dange - CVE-2026-28269
Kiteworks Core has an OS Command Injection - CVE-2025-66558
Nextcloud Twofactor WebAuthn app was updated based on public
Same vendor: nextcloud
- CVE-2025-66558
Nextcloud Twofactor WebAuthn app was updated based on public - CVE-2025-66556
Nextcloud talk allows participants to blindly delete poll dr - CVE-2025-66554
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Nextcloud Desktop discloses information when attempting to l - CVE-2025-66545
Nextcloud Groupfolders users with read-only permissions for
Same weakness: CWE-116
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