How severe is CVE-2018-17859?

CVE-2018-17859 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2018-17859 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-17859?

CVE-2018-17859 affects Joomla Joomla!. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-17859?

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

When was CVE-2018-17859 published?

CVE-2018-17859 was published on 2018-10-09 and last updated on 2026-06-17.

CVE-2018-17859

CVE-2018-17859 is a medium-severity vulnerability in Joomla Joomla! with a CVSS 3.x base score of 4.3. 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 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Joomla Joomla!
Published: 2018-10-09
Last modified: 2026-06-17

Description

An issue was discovered in Joomla! before 3.8.13. Inadequate checks in com_contact could allow mail submission in disabled forms.

Frequently asked questions

What is CVE-2018-17859?: An issue was discovered in Joomla! before 3.8.13. Inadequate checks in com_contact could allow mail submission in disabled forms.
How severe is CVE-2018-17859?: CVE-2018-17859 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2018-17859 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-17859?: CVE-2018-17859 affects Joomla Joomla!. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-17859?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-17859 published?: CVE-2018-17859 was published on 2018-10-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:joomla:joomla\!:*:*:*:*:*:*:*:*

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