How severe is CVE-2018-13359?

CVE-2018-13359 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-13359 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 20% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-13359?

CVE-2018-13359 affects Terra-master Terramaster Operating System. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-13359?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-13359 published?

CVE-2018-13359 was published on 2018-11-27 and last updated on 2026-06-17.

CVE-2018-13359

CVE-2018-13359 is a high-severity vulnerability in Terra-master Terramaster Operating System with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 20% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 20% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Terra-master Terramaster Operating System
Published: 2018-11-27
Last modified: 2026-06-17

Description

Cross-site scripting in usertable.php in TerraMaster TOS version 3.1.03 allows attackers to execute JavaScript via the "modgroup" parameter.

Frequently asked questions

What is CVE-2018-13359?: Cross-site scripting in usertable.php in TerraMaster TOS version 3.1.03 allows attackers to execute JavaScript via the "modgroup" parameter.
How severe is CVE-2018-13359?: CVE-2018-13359 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-13359 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 20% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-13359?: CVE-2018-13359 affects Terra-master Terramaster Operating System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-13359?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-13359 published?: CVE-2018-13359 was published on 2018-11-27 and last updated on 2026-06-17.

References

https://blog.securityevaluators.com/vulnerabilities-in-terramaster-tos-3-1-03-fb99cf88b86a

Affected products (1)

cpe:2.3:o:terra-master:terramaster_operating_system:3.1.03:*:*:*:*:*:*:*

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