What is the CVSS score of CVE-2016-9464?

CVE-2016-9464 has a CVSS 3.0 base score of 4.3 (Medium). CVSS vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N. EPSS exploitation probability: 0.3%.

Is there a public PoC exploit available for CVE-2016-9464?

Yes, a public proof-of-concept exploit is available for CVE-2016-9464. Prioritise patching immediately. EPSS: 0.3%.

Is there a patch available for CVE-2016-9464?

Yes, a patch is available for CVE-2016-9464. Update the affected software to the latest version immediately.

Nextcloud Server CVE-2016-9464

MEDIUM

Improper Authorization (CWE-285)

2017-03-28 support@hackerone.com

Authentication Bypass Nextcloud Server Nextcloud

4.3

CVSS 3.0 · NVD

Severity by source

NVD PRIMARY

4.3 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Lifecycle Timeline

CVE Published

Mar 28, 2017 - 02:59 cve.org

MEDIUM 4.3

DescriptionCVE.org

Nextcloud Server before 9.0.54 and 10.0.0 suffers from an improper authorization check on removing shares. The Sharing Backend as implemented in Nextcloud does differentiate between shares to users and groups. In case of a received group share, users should be able to unshare the file to themselves but not to the whole group. The previous API implementation simply unshared the file to all users in the group.

AnalysisAI

Nextcloud Server before 9.0.54 and 10.0.0 suffers from an improper authorization check on removing shares. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified under CWE-285. Nextcloud Server before 9.0.54 and 10.0.0 suffers from an improper authorization check on removing shares. The Sharing Backend as implemented in Nextcloud does differentiate between shares to users and groups. In case of a received group share, users should be able to unshare the file to themselves but not to the whole group. The previous API implementation simply unshared the file to all users in the group. Affected products include: Nextcloud Nextcloud Server. Version information: before 9.0.54.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.