Critical severity · published Nov 21, 2023
CVE-2023-49105
ownCloud Improper Authentication Vulnerability
In wildKEV
9.8
CVSS
43.2%
EPSS
Yes
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)43.2% · higher than 99% of CVEs
Exploited in the wildYes
CISA KEVListed Aug 27, 2026
Federal remediation dueAug 30, 2026
Ransomware campaign useNot known
Affected products
Which versions
OS
Owncloud Server · Owncloud
10.6.0 before 10.13.1 · source: NVD
OW
ownCloud · ownCloud
All versions, or not specified · source: KEV
In the news
BreachHigh
CISA Flags Old ownCloud Flaw After Reported Philippine Nuclear Data Theft
CISA added CVE-2023-49105 to its exploited-flaws catalog after researchers tied the old ownCloud bug to reported Philippine nuclear data theft.
The post CISA Flags Old ownCloud Flaw After Reported Philippine Nuclear Data Theft appeared first on TechRepublic .
Sep 4, 2026·TechRepublic Security
VulnerabilityCritical
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 that a Chinese-speaking threat actor weaponized the vulnerability to target a nuclear research body in the Philippines.
The vulnerability, tracked as CVE-2023-49105 (CVSS score: 9.8), is a case of
Aug 28, 2026·The Hacker News
VulnerabilityCritical
U.S. CISA adds ownCloud, Linux Kernel, and JFrog Artifactory flaws to its Known Exploited Vulnerabilities catalog
U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds ownCloud, Linux Kernel, and JFrog Artifactory flaws to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added the following vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog: CVE-2023-49105 (CVSS score of 9.8) is an improper-authentication flaw in ownCloud Server’s WebDAV functionality. An unauthenticated attacker who […]
Aug 28, 2026·Security Affairs
AdvisoryHigh
CISA Adds Three Known Exploited Vulnerabilities to Catalog
CISA has added three new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation.
CVE-2023-49105 ownCloud Improper Authentication Vulnerability
CVE-2026-53362 Linux Kernel Unspecified Vulnerability
CVE-2026-66384 JFrog Artifactory Improper Limitation of a Pathname to a Restricted Directory Vulnerability
These types of vulnerabilities are a frequent attack vector for malicious cyber actors and pose significant risks to the federal enterprise.
Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied.
While BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of KEV Catalog vulnerabilities . CISA will continue to add vulnerabiliti...
Aug 27, 2026·CISA Advisories
ThreatIntelHigh
[CISA KEV] CVE-2023-49105: ownCloud ownCloud - ownCloud Improper Authentication Vulnerability
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.
OWownCloudCVE-2023-49105
Aug 27, 2026·CISA KEV
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-49105
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-49105
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
owncloud.org
https://owncloud.org/security
owncloud.com
https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/
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