This weekWhy this label: EPSS 43%

CVE-2023-49105ownCloud Improper Authentication Vulnerability

Product: ownCloud
Added to CISA KEV: August 27, 2026
Deadline for US federal agencies: August 30, 2026
Known ransomware use: Not known
EPSS, next 30 days: 43%, higher than 98% of scored CVEs (Oct 25, 2026)
Weakness: CWE-287 Improper Authentication

What CISA says

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.

What CISA asks you to do

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.

Sources

Also exploited recently

Data from CISA's Known Exploited Vulnerabilities catalog (public domain) and FIRST EPSS, refreshed hourly. Rheono did not find or test this vulnerability; this page summarizes public sources.