CVE-2016-9464

What it is

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.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. Limited direct impact.

Exploit odds

1.6% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2017-03-28 02:59 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:56 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.6% in the next 30 days (EPSS).
• Severity: 4.3 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2017-03-28 02:59 UTC

Last modified

2026-06-17 00:56 UTC

Exploit probability

1.6% · EPSS, next 30 days

Weakness

CWE-285

Record status

Modified

Affected

• Nextcloud Server < 9.0.54
• Nextcloud Server 10.0

Attack profile CVSS 3.0 · 4.3

Attack vector

Network

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2016-9464.md and follow it. Check whether this project is affected by CVE-2016-9464. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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