An issue was discovered in Joomla! 3.0.0 through 3.9.24. Extracting an specifilcy crafted zip package could write files outside of the intended path.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-26028
• joomla-framework/archive@32c9009
• https://developer.joomla.org/security-centre/848-20210308-core-path-traversal-within-joomla-archive-zip-class.html
• https://github.com/FriendsOfPHP/security-advisories/blob/master/joomla/archive/CVE-2021-26028.yaml