CVE Watch28 ago 2026

CVE-2023-49105

ownCloud Improper Authentication Vulnerability

CVSS

9.8

Crítico

EPSS

43.2%

p99

KEV

SÍ

27 ago 2026

Exploit Today

0-100

Publicado: 21 nov 2023 · Última mod.: 28 ago 2026 · CWE-287

EPSS · 30d

11.1%EPSS · 30 días43.2%

2026-08-162026-09-12

Ficha del catálogo KEV

Producto

ownCloud / ownCloud

Vulnerabilidad

ownCloud Improper Authentication Vulnerability

Añadido a KEV

27 ago 2026

Remediar antes de

30 ago 2026

Uso conocido en ransomware

Descripción resumida

ownCloud contains an improper authentication vulnerability that allows an attacker to access, modify, or delete any file without authentication if the username of a victim is known, and the victim has no signing-key configured.

Acción requerida

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.

Notas

https://owncloud.org/security ; https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2023-49105

Descripción técnica

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.

Referencias oficiales

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