CVE-2025-66552: nextcloud server from 30.0.0 (inclusive), before 30.0.9 (exclusive), from 31.0.0 (inclusive), before 31.0.1…

CVE-2025-66552. CVSS 3.1 base score 4.3 (MEDIUM, NVD). EPSS 0.00311 (percentile 0.22411), scored 17-Oct-2026.

Affected technology

nextcloud server · from 30.0.0 (inclusive), before 30.0.9 (exclusive)
nextcloud

nextcloud server · from 31.0.0 (inclusive), before 31.0.1 (exclusive)
nextcloud

security-advisories · >= 32.0.0beta1, < 32.0.1, < 31.0.9
nextcloud

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · Low privileges required · No user interaction required

Attack conditions (NVD, CVSS 3.1): Network (remote) · Low privileges required · No user interaction required

What an attacker can do

Vendor/CNA’s CVSS 3.1 assessment (base score 4.3/10) rates confidentiality and integrity impact as none; availability impact as low. NVD’s CVSS 3.1 assessment (base score 4.3/10) rates confidentiality and availability impact as none; integrity impact as low. The description does not specify what an attacker can achieve beyond these rated impacts.

Published 18-Oct-2026 15:50 UTC

CWE: CWE-778
CCR priority: 17.3 /100 (P5)
CVSS 3.1: 4.3 /10 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N · NVD
EPSS: 0.00311 · percentile 0.22411 · 2026-10-17
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-18 15:50:37.644431+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2025-66552.html