How severe is CVE-2018-18966?

CVE-2018-18966 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2018-18966 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-18966?

CVE-2018-18966 affects Oscommerce Online Merchant. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-18966?

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

When was CVE-2018-18966 published?

CVE-2018-18966 was published on 2018-11-06 and last updated on 2026-06-17.

CVE-2018-18966

CVE-2018-18966 is a medium-severity vulnerability in Oscommerce Online Merchant with a CVSS 3.x base score of 4.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 4.9)
CVSS v2: 4.0
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Oscommerce Online Merchant
Published: 2018-11-06
Last modified: 2026-06-17

Description

osCommerce 2.3.4.1 has an incomplete '.htaccess' for blacklist filtering in the "product" page. The .htaccess file in catalog/images/ bans the html extension, but Internet Explorer render HTML elements in a .eml file.

Frequently asked questions

What is CVE-2018-18966?: osCommerce 2.3.4.1 has an incomplete '.htaccess' for blacklist filtering in the "product" page. The .htaccess file in catalog/images/ bans the html extension, but Internet Explorer render HTML elements in a .eml file.
How severe is CVE-2018-18966?: CVE-2018-18966 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2018-18966 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-18966?: CVE-2018-18966 affects Oscommerce Online Merchant. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-18966?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-18966 published?: CVE-2018-18966 was published on 2018-11-06 and last updated on 2026-06-17.

References

https://github.com/osCommerce/oscommerce2/issues/631

Affected products (1)

cpe:2.3:a:oscommerce:online_merchant:2.3.4.1:*:*:*:*:*:*:*

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