CVE-2025-66550: calendar from 4.0.0 (inclusive), before 4.7.17 (exclusive), from 5.0.0 (inclusive), before 5.2.4 (exclusive); +1 more…

CVE-2025-66550. CVSS 3.1 base score 5.7 (MEDIUM, Vendor/CNA). EPSS 0.00341 (percentile 0.26033), scored 17-Oct-2026.

Affected technology

calendar · from 4.0.0 (inclusive), before 4.7.17 (exclusive)
nextcloud

calendar · from 5.0.0 (inclusive), before 5.2.4 (exclusive)
nextcloud

security-advisories · >= 5.0.0-rc.1, < 5.2.4, < 4.7.17
nextcloud

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · Low privileges required · User interaction required

What an attacker can do

Vendor/CNA’s CVSS 3.1 assessment (base score 5.7/10) rates confidentiality and availability impact as none; integrity impact as high. The description does not specify what an attacker can achieve beyond these rated impacts.

Published 18-Oct-2026 15:50 UTC

CWE: CWE-241
CCR priority: 22.9 /100 (P4)
CVSS 3.1: 5.7 /10 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N · Vendor/CNA
EPSS: 0.00341 · percentile 0.26033 · 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-2025-66550.html