How severe is CVE-2018-16731?

CVE-2018-16731 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-16731 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-16731?

CVE-2018-16731 affects Chshcms Cscms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-16731?

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

When was CVE-2018-16731 published?

CVE-2018-16731 was published on 2018-09-08 and last updated on 2026-06-17.

CVE-2018-16731

CVE-2018-16731 is a critical-severity vulnerability in Chshcms Cscms with a CVSS 3.x base score of 9.8. 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: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Chshcms Cscms
Published: 2018-09-08
Last modified: 2026-06-17

Description

CScms 4.1 allows arbitrary file upload by (for example) adding the php extension to the default filetype list (gif, jpg, png), and then providing a .php pathname within fileurl JSON data.

Frequently asked questions

What is CVE-2018-16731?: CScms 4.1 allows arbitrary file upload by (for example) adding the php extension to the default filetype list (gif, jpg, png), and then providing a .php pathname within fileurl JSON data.
How severe is CVE-2018-16731?: CVE-2018-16731 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-16731 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-16731?: CVE-2018-16731 affects Chshcms Cscms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-16731?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-16731 published?: CVE-2018-16731 was published on 2018-09-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:chshcms:cscms:4.1:*:*:*:*:*:*:*

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