Privilege escalation in Nextcloud Server
CVE-2020-8223
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.
Vulnerability class: Privilege Escalation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.015 (72.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 72.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
- Nextcloud Server — versions 19.0.0
- Fedoraproject Fedora — versions 32, 33
- Nextcloud Server — versions Fixed in 19.0.1
Weakness classification (CWE)
References
- hackerone.com/reports/889243 (Exploit, Third Party Advisory)
- nextcloud.com/security/advisory/ (Vendor Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2020-8223?
- CVE-2020-8223 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Privilege Management. CVSS score: 6.5/10. Published 2020-10-05.
- How severe is CVE-2020-8223?
- Medium severity. CVSS v3 base score is 6.5 out of 10.