What’s Vulnerable › Vulnerabilities

CVE-2016-9461

• Severity: medium (CVSS 4.3 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2017-03-28 · updated 2026-06-17
• Weakness: CWE-275

Description

Nextcloud Server before 9.0.52 & ownCloud Server before 9.0.4 are not properly verifying edit check permissions on WebDAV copy actions. The WebDAV endpoint was not properly checking the permission on a WebDAV COPY action. This allowed an authenticated attacker with access to a read-only share to put new files in there. It was not possible to modify existing files.

Affected products

• Nextcloud Server: before 9.0.52 — fixed in 9.0.52
• Owncloud: before 9.0.4 — fixed in 9.0.4

How to fix

Upgrade to a fixed version: Nextcloud Server 9.0.52; Owncloud 9.0.4. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/97276
• https://github.com/nextcloud/server/commit/3491400261c1454a9a30d3ec96969573330120cc
• https://github.com/owncloud/core/commit/0622e635d97cb17c5e1363e370bb8268cc3d2547
• https://github.com/owncloud/core/commit/121a3304a0c37ccda0e1b63ddc528cba9121a36e
• https://github.com/owncloud/core/commit/acbbadb71ceee7f01da347f7dcd519beda78cc47
• https://github.com/owncloud/core/commit/c0a4b7b3f38ad2eaf506484b3b92ec678cb021c9
• https://hackerone.com/reports/145950
• https://nextcloud.com/security/advisory/?id=nc-sa-2016-004
• https://owncloud.org/security/advisory/?id=oc-sa-2016-014
• http://www.securityfocus.com/bid/97276
• https://github.com/nextcloud/server/commit/3491400261c1454a9a30d3ec96969573330120cc
• https://github.com/owncloud/core/commit/0622e635d97cb17c5e1363e370bb8268cc3d2547

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