What is CVE-2018-3776?

CVE-2018-3776 is a medium-severity vulnerability in HackerOne Nextcloud Server, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2018-08-12.

How severe is CVE-2018-3776?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Information disclosure in HackerOne Nextcloud Server

CVE-2018-3776

Improper input validator in Nextcloud Server prior to 12.0.3 and 11.0.5 could lead to an attacker's actions not being logged in the audit log.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2018-08-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.013 (68.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

HackerOne Nextcloud Server — versions <12.0.3 <11.0.5
Nextcloud Server

Weakness classification (CWE)

References

hackerone.com/reports/232347 (Third Party Advisory)
nextcloud.com/security/advisory/ (Vendor Advisory)

Frequently asked questions

What is CVE-2018-3776?: CVE-2018-3776 is a medium-severity vulnerability in HackerOne Nextcloud Server, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2018-08-12.
How severe is CVE-2018-3776?: Medium severity. CVSS v3 base score is 5.3 out of 10.