CVE-2025-66514EPSS p15.3%

CVE-2025-66514CVE-2025-66514

nextcloud / mail

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.

Scoring

CVSS 3.5 ()
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
EPSS0.25% probability of exploitation · percentile 15.3% · 2026-10-17T12:00:28Z
Last modified2026-10-15
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.