CVE-2019-15621: nextcloud nextcloud_server Improper Preservation of Permissions
CVSS: 6.5v3.1MediumModified
Published 04-02-2020Last modified 05-08-2024
Vulnerability summary
CVE-2019-15621 is a medium (CVSS 6.5) Improper Preservation of Permissions vulnerability in nextcloud nextcloud_server. EPSS estimates a 1.06% chance of exploitation in the next 30 days, higher than 64% of scored vulnerabilities.
CVSS score
6.5/10
010
Medium · v3.1 (NVD)EPSS score
1.06%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 04-02-2020PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
2 scores · 1 source · 2 versionsMedium 6.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:NSourcesSingle source
Medium 4.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:S/C:N/I:P/A:NSourcesSingle source
EPSS trend
Probability
1.06%
Chance of exploitation in the next 30 days
Percentile
64%
Versus all other CVEs
30-day change
0.00 pp
From 1.06% on 21-09-2026
21-09-202621-10-2026
EPSS score1.06%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Nextcloud1 product
- nextcloud_server< 14.0.13 | ≥ 15.0.0, < 15.0.9 | ≥ 16.0.0, < 16.0.2
1 vendor · 1 product