What is CVE-2019-15624?

CVE-2019-15624 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Input Validation. CVSS score: 4.9/10. Published 2020-02-04.

How severe is CVE-2019-15624?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Improper input validation in Nextcloud Server

CVE-2019-15624

Improper Input Validation in Nextcloud Server 15.0.7 allows group admins to create users with IDs of system folders.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2020-02-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.015 (72.7th percentile), scored 2026-09-29.

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
openSUSE Backports — versions sle-15
SUSE Linux Enterprise Server — versions 12
Nextcloud Server — versions 15.0.7

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

hackerone.com/reports/508493 (Exploit, Third Party Advisory)
nextcloud.com/security/advisory/ (Vendor Advisory)
lists.opensuse.org/opensuse-security-announce/2020-02/msg00019.html (vendor-advisory, Mailing List, Third Party Advisory)
lists.opensuse.org/opensuse-security-announce/2020-02/msg00022.html (vendor-advisory, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2019-15624?: CVE-2019-15624 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Input Validation. CVSS score: 4.9/10. Published 2020-02-04.
How severe is CVE-2019-15624?: Medium severity. CVSS v3 base score is 4.9 out of 10.