What is CVE-2021-22896?

CVE-2021-22896 is a medium-severity vulnerability in Nextcloud, classified under Missing Authorization. CVSS score: 4.3/10. Published 2021-06-11.

How severe is CVE-2021-22896?

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

Auth bypass in Nextcloud

CVE-2021-22896

Nextcloud Mail before 1.9.5 suffers from improper access control due to a missing permission check allowing other authenticated users to create mail aliases for other users.

Vulnerability class: Broken Access Control

EPSS: 0.010 (58.9th percentile) — read the EPSS interpretation.

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:N/I:L/A:N.

Affected products

Nextcloud
N/a Nextcloud Mail — versions Fixed in 1.9.5

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

support@hackerone.com (Third Party Advisory, x_refsource_MISC)
support@hackerone.com (Third Party Advisory, x_refsource_MISC)
support@hackerone.com (Patch, Third Party Advisory, x_refsource_MISC)
support@hackerone.com (Third Party Advisory, x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2021-22896?: CVE-2021-22896 is a medium-severity vulnerability in Nextcloud, classified under Missing Authorization. CVSS score: 4.3/10. Published 2021-06-11.
How severe is CVE-2021-22896?: Medium severity. CVSS v3 base score is 4.3 out of 10.