What is CVE-2019-15615?

CVE-2019-15615 is a medium-severity vulnerability in Nextcloud, classified under Improper Access Control. CVSS score: 6.1/10. Published 2020-02-04.

How severe is CVE-2019-15615?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Auth bypass in Nextcloud

CVE-2019-15615

A wrong check for the system time in the Android App 3.9.0 causes a bypass of the lock protection when changing the time of the system to the past.

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

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (28.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Nextcloud
Nextcloud Android — versions 3.9.1

Weakness classification (CWE)

References

hackerone.com/reports/747726 (Third Party Advisory)
nextcloud.com/security/advisory/ (Permissions Required)

Frequently asked questions

What is CVE-2019-15615?: CVE-2019-15615 is a medium-severity vulnerability in Nextcloud, classified under Improper Access Control. CVSS score: 6.1/10. Published 2020-02-04.
How severe is CVE-2019-15615?: Medium severity. CVSS v3 base score is 6.1 out of 10.