CVE-2025-66514— Nextcloud Mail stored HTML injection in subject text
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I. Basic Information for CVE-2025-66514
Vulnerability Information
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Vulnerability Title
Nextcloud Mail stored HTML injection in subject text
Source: NVD (National Vulnerability Database)
Vulnerability Description
Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform. Prior to 5.5.3, a stored HTML injection in the Mail app's message list allowed an authenticated user to inject HTML into the email subjects. Javascript was correctly blocked by the content security policy of the Nextcloud Server code.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Nextcloud Mail 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nextcloud Mail是德国Nextcloud公司的一个电子邮件。 Nextcloud Mail 5.5.3之前版本存在跨站脚本漏洞，该漏洞源于邮件列表中存在存储型HTML注入，可能导致HTML注入攻击。
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 | >= 5.2.0-beta.1, < 5.5.3 | - |
II. Public POCs for CVE-2025-66514
| # | 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-2025-66545 | 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-2025-66548 | 3.3 LOW | Nextcloud Deck app allows to spoof file extensions by using RTLO characters |
| 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
- CVE-2026-28272
Kiteworks Email Protection Gateway has a Cross-site Scriptin - CVE-2026-28271
Kiteworks Core is vulnerable to Server-Side Request Forgery - CVE-2026-28270
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
Nextcloud Contacts vulnerable to Stored XSS in contacts app - CVE-2025-66549
Nextcloud Desktop discloses information when attempting to l - CVE-2025-66545
Nextcloud Groupfolders users with read-only permissions for
Same weakness: CWE-79
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Devs Palace ERP Online mr-save cross site scripting - CVE-2026-8255
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