What’s Vulnerable › Vulnerabilities

CVE-2017-0884

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-04-05 · updated 2026-06-17
• Weakness: CWE-275

Description

Nextcloud Server before 9.0.55 and 10.0.2 suffers from a creation of folders in read-only folders despite lacking permissions issue. Due to a logical error in the file caching layer an authenticated adversary is able to create empty folders inside a shared folder. Note that this only affects folders and files that the adversary has at least read-only permissions for.

Affected products

• Nextcloud Server: before 9.0.55; from 10.0.0 before 10.0.2 — fixed in 10.0.2, 9.0.55

How to fix

Upgrade to a fixed version: Nextcloud Server 10.0.2, 9.0.55. Check the vendor advisory for mitigations.

References

• https://hackerone.com/reports/169680
• https://nextcloud.com/security/advisory/?id=nc-sa-2017-002
• https://hackerone.com/reports/169680
• https://nextcloud.com/security/advisory/?id=nc-sa-2017-002

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