What is CVE-2018-3762?

CVE-2018-3762 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 4.3/10. Published 2018-07-05.

How severe is CVE-2018-3762?

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

Vulnerability in Nextcloud Server

CVE-2018-3762

Nextcloud Server before 12.0.8 and 13.0.3 suffers from improper checks of dropped permissions for incoming shares allowing a user to still request previews for files it should not have access to.

Published 2018-07-05 · 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: 0.009 (57.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Nextcloud Server — versions <13.0.3, <12.0.8
Nextcloud Server

Weakness classification (CWE)

References

nextcloud.com/security/advisory/ (Broken Link, Vendor Advisory)
hackerone.com/reports/358339 (Third Party Advisory)

Frequently asked questions

What is CVE-2018-3762?: CVE-2018-3762 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 4.3/10. Published 2018-07-05.
How severe is CVE-2018-3762?: Medium severity. CVSS v3 base score is 4.3 out of 10.