What is CVE-2018-13356?

CVE-2018-13356 is a high-severity vulnerability in Terra-Master Terramaster Operating System, classified under Incorrect Authorization. CVSS score: 8.8/10. Published 2018-11-27.

How severe is CVE-2018-13356?

High severity. CVSS v3 base score is 8.8 out of 10.

Auth bypass in Terra-Master Terramaster Operating System

CVE-2018-13356

Incorrect access control on ajaxdata.php in TerraMaster TOS version 3.1.03 allows attackers to elevate user permissions.

Vulnerability class: Broken Access Control

Published 2018-11-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.020 (80.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Terra-Master Terramaster Operating System — versions 3.1.03

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

blog.securityevaluators.com/vulnerabilities-in-terramaster-tos-3-1-03-fb99cf88b… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-13356?: CVE-2018-13356 is a high-severity vulnerability in Terra-Master Terramaster Operating System, classified under Incorrect Authorization. CVSS score: 8.8/10. Published 2018-11-27.
How severe is CVE-2018-13356?: High severity. CVSS v3 base score is 8.8 out of 10.