What’s Vulnerable › Vulnerabilities

CVE-2017-0887

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% 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-807

Description

Nextcloud Server before 9.0.55 and 10.0.2 suffers from a bypass in the quota limitation. Due to not properly sanitizing values provided by the `OC-Total-Length` HTTP header an authenticated adversary may be able to exceed their configured user quota. Thus using more space than allowed by the administrator.

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/173622
• https://nextcloud.com/security/advisory/?id=nc-sa-2017-005
• https://hackerone.com/reports/173622
• https://nextcloud.com/security/advisory/?id=nc-sa-2017-005

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