CVE-2023-49105
9.8, critical Known exploitedownCloud Improper Authentication Vulnerability
- CVSS
- 9.8, critical critical CVSS v3.1
- EPSS, next 30 days
- 43% higher than 98.7% of scored CVEs
- Exploitation
- Confirmed in the wild
- Published
- 21 Nov 20232 years ago
Known exploited
CISA added this to the Known Exploited Vulnerabilities Catalog on 27 Aug 2026. US federal agencies had to remediate by 30 Aug 2026, a deadline that has passed.
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.
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.
Details
- Vendor
- ownCloud
- Product
- Owncloud Server
- Weakness
- CWE-287 (opens in a new tab)
- Status
- Analyzed
- Updated
- 28 Aug 2026
- Assigner
- cve@mitre.org
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References 4
Advisories 3
The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.
Other ownCloud CVEs
Every ownCloud CVE we holdSame vendor in what we hold, not a known link between the flaws.
- CVE-2023-49103 ownCloud graphapi Information Disclosure Vulnerability KEV EPSS 78% 7.5, high
Beyond this page
Is CVE-2023-49105 in your network?
This page tells you how dangerous CVE-2023-49105 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.
CVE-2023-49105 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.
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EXYS7600 OCELOT
Find it before attackers do
Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2023-49105 comes with the devices to patch.
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EXYS7950 KONDRA
Detect it if it's exploited
Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.
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Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.