CVE-2023-49105

CRITICALCVSS 9.8Known Exploited

CISA Known Exploited Vulnerability

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

Remediation deadline: August 30, 2026

Description

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.

Timeline

Published:November 21st, 2023 10:15 PM

Last modified:August 28th, 2026 5:16 AM

Added to KEV:August 27th, 2026

CVSS Scoring

CVSS v3: 9.8 (CRITICAL)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Software

From NVD CPE configuration data

Vendors

owncloud

Products

owncloud_server

Weaknesses (CWE)

CWE-287

References & Reports

Advisories, patches, and third-party reports

Source: NIST NVD · Data may lag official sources by up to one minute