CVE-2023-49105: owncloud server

csirt@kutim:~/threat-intel/cve/CVE-2023-49105

CVSS 9.8 · Critical KEV · sudah dieksploitasi EPSS 42,9%

Kerentanan Improper Authentication pada owncloud server. Skor CVSS 3.1 9.8 (Critical) menurut NVD. Masuk katalog KEV CISA pada 27 Agustus 2026, artinya sudah terbukti dieksploitasi.

Deskripsi (NVD)

An issue was discovered in ownCloud owncloud/core before 10.13.1. An attacker can access, modify, or delete any file without authentication if the username of a victim is known, and the victim has no signing-key configured. This occurs because pre-signed URLs can be accepted even when no signing-key is configured for the owner of the files. The earliest affected version is 10.6.0.

Advisory KUTIM-CSIRT

Peringatan Keamanan: Rekapitulasi Kerentanan yang Dieksploitasi Aktif (KEV CISA) Periode 15 Agustus sampai 30 September 2026 30 Sep 2026

Rincian

Terbit di NVD: 21 November 2023
Terakhir diubah: 28 Agustus 2026
Status NVD: Analyzed
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-287: Improper Authentication
EPSS (30 hari): 42,9% peluang dieksploitasi; lebih tinggi dari 98,6% CVE lain

Known Exploited Vulnerabilities (CISA)

Nama: ownCloud Improper Authentication Vulnerability
Masuk KEV: 27 Agustus 2026
Tenggat CISA: 30 Agustus 2026 (untuk instansi federal AS)
Ransomware: Belum tercatat
Tindakan wajib: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
owncloud	owncloud server	Versi 10.6.0 hingga sebelum 10.13.1

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ advisory vendor
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-49105 pemerintah AS
https://hunt.io/blog/chinese-speaking-operator-philippine-nuclear-naval-contractor advisory pihak ketiga
https://owncloud.org/security product

Sumber: NVD · CVE.org · KEV CISA · 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.