What is CVE-2019-15610?

CVE-2019-15610 is a medium-severity vulnerability in Nextcloud Circles, classified under Improper Authorization. CVSS score: 4.3/10. Published 2020-02-04.

How severe is CVE-2019-15610?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Nextcloud Circles

CVE-2019-15610

Improper authorization in the Circles app 0.17.7 causes retaining access when an email address was removed from a circle.

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

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Nextcloud Circles
Nextcloud Circles — versions 17.0.7

Weakness classification (CWE)

CWE-285 — Improper Authorization

References

hackerone.com/reports/673724 (Permissions Required, Third Party Advisory)
nextcloud.com/security/advisory/ (Vendor Advisory)

Frequently asked questions

What is CVE-2019-15610?: CVE-2019-15610 is a medium-severity vulnerability in Nextcloud Circles, classified under Improper Authorization. CVSS score: 4.3/10. Published 2020-02-04.
How severe is CVE-2019-15610?: Medium severity. CVSS v3 base score is 4.3 out of 10.