CVE-2020-13756

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.
Code Injection
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
mitreCNA
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CVEADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 96%
VendorProductVersion
sabberwormphp_css_parser
𝑥
< 8.3.1
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
http://packetstormsecurity.com/files/157923/Sabberworm-PHP-CSS-Code-Injection.html
http://seclists.org/fulldisclosure/2020/Jun/7
https://github.com/sabberworm/PHP-CSS-Parser/commit/2ebf59e8bfbf6cfc1653a5f0ed743b95062c62a4
https://github.com/sabberworm/PHP-CSS-Parser/releases/tag/8.3.1
http://packetstormsecurity.com/files/157923/Sabberworm-PHP-CSS-Code-Injection.html
http://seclists.org/fulldisclosure/2020/Jun/7
https://github.com/sabberworm/PHP-CSS-Parser/commit/2ebf59e8bfbf6cfc1653a5f0ed743b95062c62a4
https://github.com/sabberworm/PHP-CSS-Parser/releases/tag/8.3.1
https://lists.debian.org/debian-lts-announce/2025/10/msg00013.html