CVE-2025-66546: nextcloud calendar

csirt@kutim:~/threat-intel/cve/CVE-2025-66546

CVSS 3.3 · Low EPSS 0,14%

Kerentanan Authorization Bypass Through User-Controlled Key pada nextcloud calendar. Skor CVSS 3.1 3.3 (Low) menurut github.com.

Deskripsi (NVD)

Nextcloud Calendar is a calendar app for Nextcloud. Prior to 4.7.19, 5.5.6, and 6.0.1, the calendar app allowed blindly booking appointments with a squential ID without known the appointment token. This vulnerability is fixed in 4.7.19, 5.5.6, and 6.0.1.

Rincian

Terbit di NVD: 5 Desember 2025
Terakhir diubah: 17 Juni 2026
Status NVD: Analyzed
CVSS 3.1: 3.3 (Low), sumber github.com
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-639: Authorization Bypass Through User-Controlled Key
EPSS (30 hari): 0,14% peluang dieksploitasi; lebih tinggi dari 2,8% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
nextcloud	calendar	Versi 4.0.0 hingga sebelum 4.7.19
nextcloud	calendar	Versi 5.0.0 hingga sebelum 5.5.6
nextcloud	calendar	Versi 6.0.0
nextcloud	calendar	Versi 6.0.0 rc1
nextcloud	calendar	Versi 6.0.0 rc2
nextcloud	calendar	Versi 6.0.0 rc3
nextcloud	calendar	Versi 6.0.0 rc4
nextcloud	calendar	Versi 6.0.0 rc5
nextcloud	calendar	Versi 6.0.0 rc6

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7x2j-2674-fj95 patch · advisory vendor
https://hackerone.com/reports/3275810 issue tracking · advisory vendor
https://github.com/nextcloud/calendar/commit/f41650c3681fc4a4130eb883f5c0899c011326b3 patch
https://github.com/nextcloud/calendar/pull/7537 issue tracking

Sumber: NVD · CVE.org · EPSS. Halaman ini disusun otomatis dari data tersebut; pembaruan terakhir 5 Okt 2026, 20:11 WITA. Kalau sistem di Perangkat Daerah memakai produk ini dan butuh bantuan, laporkan lewat kanal pelaporan.