What is CVE-2019-15611?

CVE-2019-15611 is a medium-severity vulnerability in Nextcloud, classified under CWE-657. CVSS score: 4.9/10. Published 2020-02-04.

How severe is CVE-2019-15611?

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

Vulnerability in Nextcloud

CVE-2019-15611

Violation of Secure Design Principles in the iOS App 2.23.0 causes the app to leak its login and token to other Nextcloud services when search e.g. for federated users or registering for push notifications.

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:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.011 (64.9th percentile), scored 2026-10-25.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Nextcloud
Nextcloud iOS — versions 2.23.0

Weakness classification (CWE)

CWE-657

References

hackerone.com/reports/672623 (Permissions Required, Third Party Advisory)
nextcloud.com/security/advisory/ (Vendor Advisory)

Frequently asked questions

What is CVE-2019-15611?: CVE-2019-15611 is a medium-severity vulnerability in Nextcloud, classified under CWE-657. CVSS score: 4.9/10. Published 2020-02-04.
How severe is CVE-2019-15611?: Medium severity. CVSS v3 base score is 4.9 out of 10.