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CVE-2023-49105 (GCVE-0-2023-49105)

Vulnerability from cvelistv5 – Published: 2023-11-21 00:00 – Updated: 2026-08-28 03:55
VLAI CISA Previdian
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2023-11-27 00:00 UTC
CWE
  • n/a
  • CWE-287 - Improper Authentication
Assigner
References
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 79b73698-256a-45a9-ad14-b70fc2f9dee5

Vulnerability ID: CVE-2023-49105

Status: Confirmed

Status Updated: 2026-08-27 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-08-27
Asserted: 2026-08-27
Scope
Notes: ownCloud Improper Authentication Vulnerability | Affected: ownCloud / ownCloud | 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. | 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. | Due date: 2026-08-30 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-287
Feed CISA Known Exploited Vulnerabilities Catalog
Product ownCloud
Due Date 2026-08-30
Date Added 2026-08-27
Vendorproject ownCloud
Vulnerabilityname ownCloud Improper Authentication Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-08-27 18:00 UTC | Updated: 2026-08-27 18:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 40b6e936-c767-40ec-916b-248c46890ce8

Vulnerability ID: CVE-2023-49105

Status: Confirmed

Status Updated: 2026-08-27 17:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-08-27
Asserted: 2026-08-27
Scope
Notes: 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... | Affected: ownCloud / ownCloud | CVSS: 9.8 (CRITICAL) | EPSS: 0.11074 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title 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...
Vendor ownCloud
Product ownCloud
Added Date 2026-08-27T17:00:36.663Z
Cvss Score 9.8
Epss Score 0.11074
Cvss Severity CRITICAL
Epss Percentile 0.95592
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-08-28 18:00 UTC | Updated: 2026-08-28 18:00 UTC
Show details on NVD website
To clipboard 

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      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.