How severe is CVE-2015-8566?

CVE-2015-8566 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2015-8566 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-8566?

CVE-2015-8566 affects Joomla Session. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-8566?

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-2015-8566 published?

CVE-2015-8566 was published on 2015-12-16 and last updated on 2026-06-17.

CVE-2015-8566

CVE-2015-8566 is a high-severity vulnerability in Joomla Session with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Joomla Session
Published: 2015-12-16
Last modified: 2026-06-17

Description

The Session package 1.x before 1.3.1 for Joomla! Framework allows remote attackers to execute arbitrary code via unspecified session values.

Frequently asked questions

What is CVE-2015-8566?: The Session package 1.x before 1.3.1 for Joomla! Framework allows remote attackers to execute arbitrary code via unspecified session values.
How severe is CVE-2015-8566?: CVE-2015-8566 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2015-8566 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-8566?: CVE-2015-8566 affects Joomla Session. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-8566?: 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-2015-8566 published?: CVE-2015-8566 was published on 2015-12-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:joomla:session:1.3.0:*:*:*:*:*:*:*