What is CVE-2019-15620?

CVE-2019-15620 is a low-severity vulnerability in Nextcloud Talk, classified under Improper Authentication. CVSS score: 2.7/10. Published 2020-02-04.

How severe is CVE-2019-15620?

Low severity. CVSS v3 base score is 2.7 out of 10.

Auth bypass in Nextcloud Talk

CVE-2019-15620

Improper access control in Nextcloud Talk 6.0.3 leaks the existance and the name of private conversations when linked them to another shared item via the projects feature.

Vulnerability class: Broken Authentication

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

CVSS v3 metric

CVSS v3 base score 2.7 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (53.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.7% 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 Talk
Nextcloud Talk — versions 6.0.4

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

hackerone.com/reports/662218 (Permissions Required)
nextcloud.com/security/advisory/ (Vendor Advisory)

Frequently asked questions

What is CVE-2019-15620?: CVE-2019-15620 is a low-severity vulnerability in Nextcloud Talk, classified under Improper Authentication. CVSS score: 2.7/10. Published 2020-02-04.
How severe is CVE-2019-15620?: Low severity. CVSS v3 base score is 2.7 out of 10.