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.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | < 5.5.3 |
Related Weaknesses (CWE)
References
- https://github.com/nextcloud/mail/commit/c64fcc3b79e0c089b5e1d2e04a07bfa740b2ac0Patch
- https://github.com/nextcloud/mail/pull/11740Issue TrackingPatch
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-v394-8PatchVendor Advisory
- https://hackerone.com/reports/3357036Permissions RequiredVendor Advisory
FAQ
What is CVE-2025-66514?
CVE-2025-66514 is a vulnerability with a CVSS score of 3.5 (LOW). 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 i...
How severe is CVE-2025-66514?
CVE-2025-66514 has been rated LOW with a CVSS base score of 3.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-66514?
Check the references section above for vendor advisories and patch information. Affected products include: Nextcloud Mail.