CVE-2016-9464

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

Nextcloud Server Nextcloud Server before 9.0.54 and 10.0.0

CVSS v3.0 NVD

4.3 MEDIUMCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS v2.0 NVD

4.0 MEDIUMAV:N/AC:L/Au:S/C:N/I:P/A:N

EPSS

1.62% chance of exploitation in the next 30 days, 76th percentile

Published

2017-03-28

Updated

2024-08-06

Proof-of-concept exploits (1)

• https://hackerone.com/reports/153905

Security advisories

• https://nextcloud.com/security/advisory/?id=nc-sa-2016-007
• http://www.securityfocus.com/bid/97287
• nextcloud/server/commit/3387e5d00fcf6b2ea6b285a091e5743f545e7202

References

• CVE Record
• NVD entry