CVE-2019-15621

MEDIUMNVD 6.56.5—

6.5

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.

CVSS v3: 6.5
EG Score: 6.5(medium)
EPSS: 29.7%
KEV: Not listed

Published

February 4, 2020

Last Modified

November 21, 2024

References (8)

support@hackeronehttp://lists.opensuse.org/opensuse-security-announce/2020-02/msg00019.html
support@hackeronehttp://lists.opensuse.org/opensuse-security-announce/2020-02/msg00022.html
support@hackeronehttps://hackerone.com/reports/619484
support@hackeronehttps://nextcloud.com/security/advisory/?id=NC-SA-2020-012
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00019.html
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00022.html
af854a3a-2127-422b-91ae-364da2661108https://hackerone.com/reports/619484
af854a3a-2127-422b-91ae-364da2661108https://nextcloud.com/security/advisory/?id=NC-SA-2020-012

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-281Improper Preservation of Permissions

Data Freshness Timeline

(refreshed 7× in last 7d / 7× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:38 UTCepss_batch
2026-05-27 08:17 UTCEG score recompute
2026-05-27 08:17 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2019-15621?

CVE-2019-15621 is a medium vulnerability published on February 4, 2020. 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.

When was CVE-2019-15621 disclosed?

CVE-2019-15621 was first published in the National Vulnerability Database on February 4, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2019-15621 actively exploited?

CVE-2019-15621 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2019-15621?

CVE-2019-15621 has a CVSS v3 base score of 6.5 (NVD).

How do I remediate CVE-2019-15621?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-15621, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2019-15621

📅 Published

🔄 Last Modified

🔗 References (8)