What is CVE-2018-16463?

CVE-2018-16463 is a low-severity vulnerability in Nextcloud Server, classified under Session Fixation. CVSS score: 3.1/10. Published 2018-10-30.

How severe is CVE-2018-16463?

Low severity. CVSS v3 base score is 3.1 out of 10.

Vulnerability in Nextcloud Server

CVE-2018-16463

A bug causing session fixation in Nextcloud Server prior to 14.0.0, 13.0.3 and 12.0.8 could potentially allow an attacker to obtain access to password protected shares.

Published 2018-10-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.1 (Low). Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (43.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Nextcloud Server — versions 14.0.0
Nextcloud Server — versions <14.0.0, <13.0.3, <12.0.8

Weakness classification (CWE)

CWE-384 — Session Fixation

References

nextcloud.com/security/advisory/ (Vendor Advisory)
hackerone.com/reports/237184 (Third Party Advisory)

Frequently asked questions

What is CVE-2018-16463?: CVE-2018-16463 is a low-severity vulnerability in Nextcloud Server, classified under Session Fixation. CVSS score: 3.1/10. Published 2018-10-30.
How severe is CVE-2018-16463?: Low severity. CVSS v3 base score is 3.1 out of 10.