CVE-2021-32726: nextcloud server

csirt@kutim:~/threat-intel/cve/CVE-2021-32726

CVSS 9.8 · Critical EPSS 1,8%

Kerentanan Incorrect Ownership Assignment pada nextcloud server. Skor CVSS 3.1 9.8 (Critical) menurut NVD.

Deskripsi (NVD)

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, webauthn tokens were not deleted after a user has been deleted. If a victim reused an earlier used username, the previous user could gain access to their account. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds.

Rincian

Terbit di NVD: 12 Juli 2021
Terakhir diubah: 17 Juni 2026
Status NVD: Modified
CVSS 3.1: 9.8 (Critical), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-708: Incorrect Ownership Assignment
CWE-287: Improper Authentication
EPSS (30 hari): 1,8% peluang dieksploitasi; lebih tinggi dari 77,6% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
nextcloud	nextcloud server	Semua versi sebelum 19.0.13
nextcloud	nextcloud server	Versi 20.0.0 hingga sebelum 20.0.11
nextcloud	nextcloud server	Versi 21.0.0 hingga sebelum 21.0.3

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg advisory pihak ketiga
https://github.com/nextcloud/server/pull/27532 advisory pihak ketiga
https://security.gentoo.org/glsa/202208-17 advisory pihak ketiga
https://hackerone.com/reports/1202590 permissions required

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.