CVE-2023-49105
ownCloud Improper Authentication Vulnerability - [Actively Exploited]
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.
INFO
Published Date :
Nov. 21, 2023, 10:15 p.m.
Last Modified :
Aug. 28, 2026, 12:21 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
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.
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.
Unknown
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
Affected Products
The following products are affected by CVE-2023-49105
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Upgrade to ownCloud version 10.13.3 or later.
Public PoC/Exploit Available at Github
CVE-2023-49105 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2023-49105.
| URL | Resource |
|---|---|
| https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ | Vendor Advisory |
| https://owncloud.org/security | Product |
| https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ | Vendor Advisory |
| https://owncloud.org/security | Product |
| https://hunt.io/blog/chinese-speaking-operator-philippine-nuclear-naval-contractor | Third Party Advisory |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-49105 | US Government Resource |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-49105 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2023-49105
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
ownCloud exploits for CVE-2023-49105
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2023-49105 vulnerability anywhere in the article.
-
The Hacker News
ownCloud Flaw Exploited to Steal Nuclear Records From Philippine Research Body
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Thursday added a critical security flaw impacting ownCloud to its Known Exploited Vulnerabilities (KEV) catalog following reports th ... Read more
-
security.nl
Filipijns nucleair onderzoeksinstituut gehackt via kritiek ownCloud-lek
Aanvallers hebben een Filipijns nucleair onderzoeksinstituut door middel van een bekende kritieke kwetsbaarheid in ownCloud weten te hacken, zo meldt cybersecuritybedrijf Hunt.io. Bij de aanval zou ne ... Read more
The following table lists the changes that have been made to the
CVE-2023-49105 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Modified Analysis by [email protected]
Aug. 28, 2026
Action Type Old Value New Value Added Reference Type CISA-ADP: https://hunt.io/blog/chinese-speaking-operator-philippine-nuclear-naval-contractor Types: Third Party Advisory Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-49105 Types: US Government Resource -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 28, 2026
Action Type Old Value New Value Changed SSVC {'id': 'CVE-2023-49105', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-27T17:44:05.938842Z'} {'id': 'CVE-2023-49105', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2023-11-27T00:00:00+00:00'} -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Aug. 27, 2026
Action Type Old Value New Value Added Reference https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ Added Reference https://owncloud.org/security Removed Reference https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ Removed Reference https://owncloud.org/security Removed Reference Type https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ Types: Vendor Advisory Removed Reference Type https://owncloud.org/security Types: Product -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 27, 2026
Action Type Old Value New Value Added CWE CWE-287 Added Reference https://hunt.io/blog/chinese-speaking-operator-philippine-nuclear-naval-contractor Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-49105 Changed SSVC {'id': 'CVE-2023-49105', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2023-11-28T05:00:24.236864Z'} {'id': 'CVE-2023-49105', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-27T17:44:05.938842Z'} -
CVE Modified by [email protected]
Aug. 27, 2026
Action Type Old Value New Value Added Reference https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ Added Reference https://owncloud.org/security Removed Reference https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ Removed Reference https://owncloud.org/security Removed Reference Type https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ Types: Vendor Advisory Removed Reference Type https://owncloud.org/security Types: Product -
CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725
Aug. 27, 2026
Action Type Old Value New Value Added Date Added 2026-08-27 Added Due Date 2026-08-27 Added Required Action 2026-08-27 Added Vulnerability Name 2026-08-27 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2023-49105', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2023-11-28T05:00:24.236864Z'} -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'n/a', 'product': 'n/a', 'versions': [{'status': 'affected', 'version': 'n/a'}]}] -
Modified Analysis by [email protected]
Apr. 02, 2025
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:owncloud:owncloud:*:*:*:*:*:*:*:* versions up to (excluding) 10.13.1 OR *cpe:2.3:a:owncloud:owncloud_server:*:*:*:*:*:*:*:* versions from (including) 10.6.0 up to (excluding) 10.13.1 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ Added Reference https://owncloud.org/security -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Nov. 30, 2023
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ No Types Assigned https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ Vendor Advisory Changed Reference Type https://owncloud.org/security No Types Assigned https://owncloud.org/security Product Added CWE NIST CWE-287 Added CPE Configuration OR *cpe:2.3:a:owncloud:owncloud:*:*:*:*:*:*:*:* versions up to (excluding) 10.13.1 -
CVE Received by [email protected]
Nov. 21, 2023
Action Type Old Value New Value Added 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. Added Reference MITRE https://owncloud.org/security [No types assigned] Added Reference MITRE https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ [No types assigned] Added CVSS V3.1 MITRE AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H