CVE-2025-66547: nextcloud server from 31.0.0 (inclusive), before 31.0.1 (exclusive); +1 more affected products

CVE-2025-66547. CVSS 3.1 base score 4.3 (MEDIUM, Vendor/CNA). EPSS 0.00279 (percentile 0.19028), scored 17-Oct-2026.

Affected technology

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

security-advisories · < 31.0.1
nextcloud

Component: Not specified by the source

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

What an attacker can do

Non-privileged users can modify tags on files they should not have access to via bulk tagging. Vendor/CNA’s CVSS 3.1 assessment (base score 4.3/10) rates confidentiality and availability impact as none; integrity impact as low.

Published 18-Oct-2026 15:50 UTC

CWE: CWE-639
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 · Vendor/CNA
EPSS: 0.00279 · percentile 0.19028 · 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-2025-66547.html