CVE-2025-66512: nextcloud server

csirt@kutim:~/threat-intel/cve/CVE-2025-66512

CVSS 6.1 · Medium EPSS 0,28%

Kerentanan Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) pada nextcloud server. Skor CVSS 3.1 6.1 (Medium) menurut NVD.

Deskripsi (NVD)

Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Server Enterprise prior to 31.0.12 and 32.0.3, a missing sanitization allowed malicious users to circumvent the content security policy when a malicious user manages to trick a user it viewing an uploaded SVG outside of the Nextcloud Servers web page.

Rincian

Terbit di NVD: 5 Desember 2025
Terakhir diubah: 17 Juni 2026
Status NVD: Analyzed
CVSS 3.1: 6.1 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
EPSS (30 hari): 0,28% peluang dieksploitasi; lebih tinggi dari 19,0% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
nextcloud	nextcloud server	Versi 31.0.0 hingga sebelum 31.0.12
nextcloud	nextcloud server	Versi 32.0.0 hingga sebelum 32.0.3

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qcw2-p26m-9gc5 patch · advisory vendor
https://hackerone.com/reports/3357808 issue tracking · advisory vendor
https://github.com/nextcloud/viewer/commit/5044a27d61bc40c0f134298d36af91f865335b63 patch
https://github.com/nextcloud/viewer/pull/3023 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.