Description
Joomla! Core is prone to a prototype pollution vulnerability. Exploiting this issue may allow attackers to add or modify existing properties of an "Object", when controlling part of it's structure. Joomla! Core versions 3.x.x ranging from 3.0.0 and up to and including 3.9.4 are vulnerable.
Remediation
Update to Joomla! Core version 3.9.5 or latest
References
Related Vulnerabilities
Ruby Improper Input Validation Vulnerability (CVE-2013-1821)
Envoy Proxy Out-of-bounds Write Vulnerability (CVE-2019-18801)
Liferay DXP Origin Validation Error Vulnerability (CVE-2022-25146)
MySQL CVE-2019-2819 Vulnerability (CVE-2019-2819)
WordPress Plugin Social Share Icons & Social Share Buttons Unspecified Vulnerability (1.4)