CVE-2019-15621
MEDIUMCVSS 6.5/10EPSS 1.06%
Last modified
CVE-2019-15621 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 1.06% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | Nextcloud Server | < 14.0.13 |
| Nextcloud | Nextcloud Server | >= 15.0.0, < 15.0.9 |
| Nextcloud | Nextcloud Server | >= 16.0.0, < 16.0.2 |
References
- https://hackerone.com/reports/619484Permissions Required
- https://nextcloud.com/security/advisory/?id=NC-SA-2020-012Vendor Advisory
- https://hackerone.com/reports/619484Permissions Required
- https://nextcloud.com/security/advisory/?id=NC-SA-2020-012Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-15621?
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.
How severe is CVE-2019-15621?
CVE-2019-15621 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.06% probability of exploitation in the next 30 days.
How do I fix CVE-2019-15621?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2019-15621?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST