CVE-2021-32655: nextcloud server

csirt@kutim:~/threat-intel/cve/CVE-2021-32655

CVSS 3.5 · Low EPSS 1,0%

Kerentanan Improper Handling of Unexpected Data Type pada nextcloud server. Skor CVSS 3.1 3.5 (Low) menurut NVD.

Deskripsi (NVD)

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.11, 20.0.10, and 21.0.2, an attacker is able to convert a Files Drop link to a federated share. This causes an issue on the UI side of the sharing user. When the sharing user opens the sharing panel and tries to remove the "Create" privileges of this unexpected share, Nextcloud server would silently grant the share read privileges. The vulnerability is patched in versions 19.0.11, 20.0.10 and 21.0.2. No workarounds are known to exist.

Rincian

Terbit di NVD: 1 Juni 2021
Terakhir diubah: 17 Juni 2026
Status NVD: Modified
CVSS 3.1: 3.5 (Low), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-241: Improper Handling of Unexpected Data Type
EPSS (30 hari): 1,0% peluang dieksploitasi; lebih tinggi dari 62,9% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
nextcloud	nextcloud server	Semua versi sebelum 19.0.11
nextcloud	nextcloud server	Versi 20.0.0 hingga sebelum 20.0.10
nextcloud	nextcloud server	Versi 21.0.0 hingga sebelum 21.0.2

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-grph-cm44-p3jv advisory pihak ketiga
https://hackerone.com/reports/1167929 permissions required · advisory pihak ketiga
https://security.gentoo.org/glsa/202208-17 advisory pihak ketiga

Sumber: NVD · CVE.org · EPSS. Halaman ini disusun otomatis dari data tersebut; pembaruan terakhir 5 Okt 2026, 20:10 WITA. Kalau sistem di Perangkat Daerah memakai produk ini dan butuh bantuan, laporkan lewat kanal pelaporan.