CVE-2025-66546: calendar 6.0.0; +1 more affected products

CVE-2025-66546. CVSS 3.1 base score 3.3 (LOW, Vendor/CNA). EPSS 0.00139 (percentile 0.02901), scored 17-Oct-2026.

Affected technology

calendar · from 4.0.0 (inclusive), before 4.7.19 (exclusive)
nextcloud

calendar · from 5.0.0 (inclusive), before 5.5.6 (exclusive)
nextcloud

calendar · 6.0.0
nextcloud

calendar · 6.0.0 · update rc1
nextcloud

calendar · 6.0.0 · update rc2
nextcloud

calendar · 6.0.0 · update rc3
nextcloud

calendar · 6.0.0 · update rc4
nextcloud

calendar · 6.0.0 · update rc5
nextcloud

calendar · 6.0.0 · update rc6
nextcloud

security-advisories · >= 6.0.0-rc.1, < 6.0.1, >= 5.0.0-rc.1, < 5.5.6, >= 3.0.0-beta1, < 4.7.19
nextcloud

Component: Not specified by the source

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

What an attacker can do

Vendor/CNA’s CVSS 3.1 assessment (base score 3.3/10) rates confidentiality impact as low; integrity and availability impact as none. The description does not specify what an attacker can achieve beyond these rated impacts.

Published 18-Oct-2026 15:50 UTC

CWE: CWE-639
CCR priority: 13.2 /100 (P5)
CVSS 3.1: 3.3 /10 · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N · Vendor/CNA
EPSS: 0.00139 · percentile 0.02901 · 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-2025-66546.html