How severe is CVE-2018-9921?

CVE-2018-9921 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2018-9921 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-2018-9921?

CVE-2018-9921 affects Cmsmadesimple Cms Made Simple. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-9921?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-9921 published?

CVE-2018-9921 was published on 2018-04-23 and last updated on 2026-06-17.

CVE-2018-9921

CVE-2018-9921 is a medium-severity vulnerability in Cmsmadesimple Cms Made Simple with a CVSS 3.x base score of 5.3. 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-22.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Cmsmadesimple Cms Made Simple
Published: 2018-04-23
Last modified: 2026-06-17

Description

In CMS Made Simple 2.2.7, a Directory Traversal issue makes it possible to determine the existence of files and directories outside the web-site installation directory, and determine whether a file has contents matching a specified checksum. The attack uses an admin/checksum.php?__c= request.

Frequently asked questions

What is CVE-2018-9921?: In CMS Made Simple 2.2.7, a Directory Traversal issue makes it possible to determine the existence of files and directories outside the web-site installation directory, and determine whether a file has contents matching a specified checksum. The attack uses an admin/checksum.php?__c= request.
How severe is CVE-2018-9921?: CVE-2018-9921 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2018-9921 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-2018-9921?: CVE-2018-9921 affects Cmsmadesimple Cms Made Simple. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-9921?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-9921 published?: CVE-2018-9921 was published on 2018-04-23 and last updated on 2026-06-17.

References

https://gist.github.com/0xn1k5/ef4c7c7a26c7d8a803ef3a85f1000c98

Affected products (1)

cpe:2.3:a:cmsmadesimple:cms_made_simple:2.2.7:*:*:*:*:*:*:*

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