How severe is CVE-2018-6383?

CVE-2018-6383 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-6383 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-6383?

CVE-2018-6383 affects Monstra. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-6383?

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-2018-6383 published?

CVE-2018-6383 was published on 2018-01-29 and last updated on 2026-06-17.

CVE-2018-6383

CVE-2018-6383 is a high-severity vulnerability in Monstra with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 14% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-184.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 14% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-184
Affected product: Monstra
Published: 2018-01-29
Last modified: 2026-06-17

Description

Monstra CMS through 3.0.4 has an incomplete "forbidden types" list that excludes .php (and similar) file extensions but not the .pht or .phar extension, which allows remote authenticated Admins or Editors to execute arbitrary PHP code by uploading a file, a different vulnerability than CVE-2017-18048.

Frequently asked questions

What is CVE-2018-6383?: Monstra CMS through 3.0.4 has an incomplete "forbidden types" list that excludes .php (and similar) file extensions but not the .pht or .phar extension, which allows remote authenticated Admins or Editors to execute arbitrary PHP code by uploading a file, a different vulnerability than CVE-2017-18048.
How severe is CVE-2018-6383?: CVE-2018-6383 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-6383 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-6383?: CVE-2018-6383 affects Monstra. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-6383?: 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-2018-6383 published?: CVE-2018-6383 was published on 2018-01-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:monstra:monstra:*:*:*:*:*:*:*:*

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Other CWE-184 vulnerabilities

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CVE-2025-71320 — Critical (CVSS 9.8): picklescan before 0.0.33 contains an incomplete deny-list that fails to block pydoc.locate and operator.methodcaller…
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