What’s Vulnerable › Vulnerabilities

CVE-2019-15621

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-02-04 · updated 2026-06-17
• Weakness: CWE-281

Description

Improper permissions preservation in Nextcloud Server 16.0.1 causes sharees to be able to reshare with write permissions when sharing the mount point of a share they received, as a public link.

Affected products

• Nextcloud Server: before 14.0.13; from 15.0.0 before 15.0.9; from 16.0.0 before 16.0.2 — fixed in 14.0.13, 15.0.9, 16.0.2

How to fix

Upgrade to a fixed version: Nextcloud Server 14.0.13, 15.0.9, 16.0.2. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00019.html
• http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00022.html
• https://hackerone.com/reports/619484
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-012
• http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00019.html
• http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00022.html
• https://hackerone.com/reports/619484
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-012

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