How severe is CVE-2018-17418?

CVE-2018-17418 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-17418 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-17418?

CVE-2018-17418 affects Monstra. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-17418?

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-2018-17418 published?

CVE-2018-17418 was published on 2019-03-07 and last updated on 2026-06-17.

CVE-2018-17418

CVE-2018-17418 is a high-severity vulnerability in Monstra with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-434.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 6.5
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Monstra
Published: 2019-03-07
Last modified: 2026-06-17

Description

Monstra CMS 3.0.4 allows remote attackers to execute arbitrary PHP code via a mixed-case file extension, as demonstrated by the 123.PhP filename, because plugins\box\filesmanager\filesmanager.admin.php mishandles the forbidden_types variable.

Frequently asked questions

What is CVE-2018-17418?: Monstra CMS 3.0.4 allows remote attackers to execute arbitrary PHP code via a mixed-case file extension, as demonstrated by the 123.PhP filename, because plugins\box\filesmanager\filesmanager.admin.php mishandles the forbidden_types variable.
How severe is CVE-2018-17418?: CVE-2018-17418 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-17418 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-17418?: CVE-2018-17418 affects Monstra. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-17418?: 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-2018-17418 published?: CVE-2018-17418 was published on 2019-03-07 and last updated on 2026-06-17.

References

https://github.com/AlwaysHereFight/monstra_cms-3.0.4--getshell/blob/master/README.md

Affected products (1)

cpe:2.3:a:monstra:monstra:3.0.4:*:*:*:*:*:*:*

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