How severe is CVE-2018-17858?

CVE-2018-17858 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-17858 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-17858?

CVE-2018-17858 affects Joomla Joomla!. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-17858?

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-2018-17858 published?

CVE-2018-17858 was published on 2018-10-09 and last updated on 2026-06-17.

CVE-2018-17858

CVE-2018-17858 is a high-severity vulnerability in Joomla Joomla! with a CVSS 3.x base score of 8.8. 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-352.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Joomla Joomla!
Published: 2018-10-09
Last modified: 2026-06-17

Description

An issue was discovered in Joomla! before 3.8.13. com_installer actions do not have sufficient CSRF hardening in the backend.

Frequently asked questions

What is CVE-2018-17858?: An issue was discovered in Joomla! before 3.8.13. com_installer actions do not have sufficient CSRF hardening in the backend.
How severe is CVE-2018-17858?: CVE-2018-17858 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-17858 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-17858?: CVE-2018-17858 affects Joomla Joomla!. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-17858?: 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-2018-17858 published?: CVE-2018-17858 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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