CVE-2016-9464
Nextcloud Server before 9.0.54 and 10.0.0 suffers from an improper authorization check on removing shares.
Does this matter?
Lower severity and a low EPSS score (1.62%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.0
- 4.3 MEDIUMCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- EPSS
- 1.62% probability · 76th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-285
- Affected
- nextcloud/nextcloud server
- Source
- support@hackerone.com
EPSS 1.6% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/97287Third Party Advisory, VDB Entry
- https://github.com/nextcloud/server/commit/3387e5d00fcf6b2ea6b285a091e5743f545e7202Issue Tracking, Patch, Third Party Advisory
- https://github.com/nextcloud/server/commit/7289cb5ec0b812992ab0dfb889744b94bc0994f0Issue Tracking, Patch, Third Party Advisory
- https://github.com/nextcloud/server/commit/a5471b4a3e3f30e99e4de39c97c0c3b3c2f1618fIssue Tracking, Patch, Third Party Advisory
- https://github.com/nextcloud/server/commit/e2c4f4f9aa11bc92e8f2212cce73841b922187e8Issue Tracking, Patch, Third Party Advisory
- https://hackerone.com/reports/153905Exploit, Third Party Advisory
- https://nextcloud.com/security/advisory/?id=nc-sa-2016-007Patch, Vendor Advisory
- http://www.securityfocus.com/bid/97287Third Party Advisory, VDB Entry
- https://github.com/nextcloud/server/commit/3387e5d00fcf6b2ea6b285a091e5743f545e7202Issue Tracking, Patch, Third Party Advisory
- https://github.com/nextcloud/server/commit/7289cb5ec0b812992ab0dfb889744b94bc0994f0Issue Tracking, Patch, Third Party Advisory
- https://github.com/nextcloud/server/commit/a5471b4a3e3f30e99e4de39c97c0c3b3c2f1618fIssue Tracking, Patch, Third Party Advisory
- https://github.com/nextcloud/server/commit/e2c4f4f9aa11bc92e8f2212cce73841b922187e8Issue Tracking, Patch, Third Party Advisory
- https://hackerone.com/reports/153905Exploit, Third Party Advisory
- https://nextcloud.com/security/advisory/?id=nc-sa-2016-007Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.