What is CVE-2023-28646?

CVE-2023-28646 is a medium-severity vulnerability in Nextcloud, classified under Improper Preservation of Permissions. CVSS score: 4.4/10. Published 2023-03-30.

How severe is CVE-2023-28646?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Auth bypass in Nextcloud

CVE-2023-28646

Nextcloud android is an android app for interfacing with the nextcloud home server ecosystem. In versions from 3.7.0 and before 3.24.1 an attacker that has access to the unlocked physical device can bypass the Nextcloud Android Pin/passcode protection via a thirdparty app. This allows to see meta information like sharer, sharees and activity of files. It is recommended that the Nextcloud Android app is upgraded to 3.24.1. There are no known workarounds for this vulnerability.

EPSS: 0.002 (13.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:P/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L.

Affected products

Nextcloud
Nextcloud Security-advisories — versions >= 3.7.0, < 3.24.1

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)

Frequently asked questions

What is CVE-2023-28646?: CVE-2023-28646 is a medium-severity vulnerability in Nextcloud, classified under Improper Preservation of Permissions. CVSS score: 4.4/10. Published 2023-03-30.
How severe is CVE-2023-28646?: Medium severity. CVSS v3 base score is 4.4 out of 10.