Description
A logic error in Nextcloud Server 19.0.0 caused a privilege escalation allowing malicious users to reshare with higher permissions than they got assigned themselves.
References (4)
Core 4
Core References
Exploit, Third Party Advisory x_refsource_misc
https://hackerone.com/reports/889243
Vendor Advisory x_refsource_misc
https://nextcloud.com/security/advisory/?id=NC-SA-2020-029
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KC6HLX5SG4PZO6Y54D2LFJ4ATG76BKOP/
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T7FX3O6SJE2S52I2HAA4DSTUIISP5BNA/
Scores
CVSS v3
6.5
EPSS
0.0014
EPSS Percentile
33.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Details
CWE
CWE-269
Status
published
Products (3)
fedoraproject/fedora
32
fedoraproject/fedora
33
nextcloud/nextcloud_server
19.0.0
Published
Oct 05, 2020
Tracked Since
Feb 18, 2026