Critical 9.8Known exploited (CISA KEV)Published Nov 21, 2023

CVE-2023-49105An issue was discovered in ownCloud owncloud/core before 10.13.1.

Updated under an hour ago (2026-10-19 07:30 UTC)

Does this affect you?

It affects owncloud_server. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Aug 27, 2026; federal agencies had to remediate by Aug 30, 2026. Treat that date as your deadline.

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Exploited in the last 30 days

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: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N
Weakness (CWE): CWE-287
Known exploited: Added to CISA KEV Aug 27, 2026; federal remediation due Aug 30, 2026Apply 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 (exploitation in the next 30 days): 42.92% (percentile 99)
Assigned by: mitre
NVD analysis: Analyzed
Record last updated: Aug 28, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

owncloud owncloud_server owncloud:owncloud_server	from 10.6.0 before 10.13.1	NVD

References

https://owncloud.org/securityproduct
https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/vendor-advisory
https://hunt.io/blog/chinese-speaking-operator-philippine-nuclear-naval-contractorthird-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-49105us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.