CVE-2023-49105

Published Nov 21, 2023

Last updated 9 days ago

Cloud

API

Overview

AI description

Automated description summarized from trusted sources.

CVE-2023-49105 is an authentication bypass vulnerability found in ownCloud Server, specifically within its WebDAV API implementation. This flaw arises from the improper validation of pre-signed URLs when the targeted user does not have a signing-key configured. An attacker can exploit this vulnerability by knowing a victim's username, allowing them to access, modify, or delete any of that user's files without needing to authenticate. This issue affects ownCloud Server versions 10.6.0 through 10.13.0.

Description: 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.
Source: cve@mitre.org
NVD status: Analyzed
Products: owncloud_server

Risk scores

CVSS 3.1

Type: Primary
Base score: 9.8
Impact score: 5.9
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: CRITICAL

Known exploits

Data from CISA

Vulnerability name: ownCloud Improper Authentication Vulnerability
Exploit added on: Aug 27, 2026
Exploit action due: Aug 30, 2026
Required action: 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.

Weaknesses

nvd@nist.gov: CWE-287
134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-287

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:owncloud:owncloud_server:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "C9361F71-3BBC-4E79-9607-AD83017DD232",
            "versionEndExcluding": "10.13.1",
            "versionStartIncluding": "10.6.0",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.