CVE-2015-8562

CVE-2015-8562 is a high-severity vulnerability in Joomla Joomla! with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 98% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-20.

Key facts

Description

Joomla! 1.5.x, 2.x, and 3.x before 3.4.6 allow remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via the HTTP User-Agent header, as exploited in the wild in December 2015.

Frequently asked questions

What is CVE-2015-8562?
Joomla! 1.5.x, 2.x, and 3.x before 3.4.6 allow remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via the HTTP User-Agent header, as exploited in the wild in December 2015.
How severe is CVE-2015-8562?
CVE-2015-8562 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2015-8562 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 98% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-8562?
CVE-2015-8562 primarily affects Joomla Joomla!. In total, 95 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-8562?
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-2015-8562 published?
CVE-2015-8562 was published on 2015-12-16 and last updated on 2026-06-17.

References

Affected products (95)

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