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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",
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}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.