Sabberworm PHP CSS Parser before 8.3.1 calls eval on uncontrolled data, possibly leading to remote code execution if the function allSelectors() or getSelectorsBySpecificity() is called with input from an attacker.
packetstormsecurity.com/files/157923/Sabberworm-PHP-CSS-Code-Injection.html
seclists.org/fulldisclosure/2020/Jun/7
github.com/FriendsOfPHP/security-advisories/blob/master/sabberworm/php-css-parser/CVE-2020-13756.yaml
github.com/sabberworm/PHP-CSS-Parser/commit/2ebf59e8bfbf6cfc1653a5f0ed743b95062c62a4
github.com/sabberworm/PHP-CSS-Parser/releases/tag/8.3.1
nvd.nist.gov/vuln/detail/CVE-2020-13756
packetstormsecurity.com/files/cve/CVE-2020-13756