CVE-2025-66514
Nextcloud Mail stored HTML injection in subject text
- State
- Published
- Severity
- 3.5 Low
- Published
- Dec 5, 2025
- Updated
- Dec 8, 2025
- Reserved
- Dec 3, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 3.5 Low | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N | GitHub_M |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
security-advisoriesnextcloud |
|
References
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