Critical Actively exploited

CVE-2023-49105

ownCloud Improper Authentication Vulnerability

What this means

Weakness: The authentication mechanism can be bypassed, letting an attacker pose as a legitimate user.
Likelihood: Exploitation is not hypothetical: CISA has observed it in the wild.

What to doTop priority: CISA sets the remediation deadline at 30 August 2026.

Read automatically from the CVSS vector, the weakness type (CWE) and the EPSS score. The technical description above remains the one published by NIST.

Published: 27 August 2026
CVSS: —
EPSS: 43.21% probability of exploitation within 30 days · above 99% of all CVEs
Weakness: CWE-287
CISA due date: 30 August 2026 past due
Sources: cisa-kev

Our analysis A 2023 ownCloud flaw resurfaces and opens files with no credentials at all

References

https://nvd.nist.gov/vuln/detail/CVE-2023-49105