CVE-2023-49105
criticalpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.432 · 99 %ileexploit · PoCDEEURUUSadded 2026-08-27remediate by 2026-08-30
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.
EPSS · scored 2026-10-23
ownCloud Improper Authentication Vulnerability
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
exploits (1)
Public proof-of-concept and weaponised exploit code.
- ambionics/owncloud-exploitsownCloud exploits for CVE-2023-49105PoC · poc_in_github
affected products (5)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2023-2985ownCloud: Mehrere SchwachstellenDeutsch2023-11-21csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in ownCloud ausnutzen, um Informationen offenzulegen, Sicherheitsvorkehrungen zu umgehen und Dateien zu manipulieren.
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (9)
External citations — patches, advisories, analysis.
- https://cxsecurity.com/cveshow/CVE-2023-49105/cnnvd
- https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/cnnvd
- https://owncloud.org/securitycnnvd
- https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/enisa_euvd
- https://owncloud.org/securityenisa_euvd
- https://hunt.io/blog/chinese-speaking-operator-philippine-nuclear-naval-contractorThird Party Advisorynvd
- https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/Vendor Advisorynvd
- https://owncloud.org/securityProductnvd
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