CVE-2020-13756

Name: CVE-2020-13756
Creator: NVD / NIST
Published: 2020-06-03T14:15:12.703+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 55.08%

Last modified Jun 17, 2026

CVE-2020-13756 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 55.08% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

55.08%

98.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-94

Affected Software

Vendor	Product	Versions
Sabberworm	Php Css Parser	< 8.3.1

References

http://packetstormsecurity.com/files/157923/Sabberworm-PHP-CSS-Code-Injection.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2020/Jun/7Exploit, Mailing List, Third Party Advisory
https://github.com/sabberworm/PHP-CSS-Parser/commit/2ebf59e8bfbf6cfc1653a5f0ed743b95062c62a4Patch, Third Party Advisory
https://github.com/sabberworm/PHP-CSS-Parser/releases/tag/8.3.1Release Notes, Third Party Advisory
http://packetstormsecurity.com/files/157923/Sabberworm-PHP-CSS-Code-Injection.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2020/Jun/7Exploit, Mailing List, Third Party Advisory
https://github.com/sabberworm/PHP-CSS-Parser/commit/2ebf59e8bfbf6cfc1653a5f0ed743b95062c62a4Patch, Third Party Advisory
https://github.com/sabberworm/PHP-CSS-Parser/releases/tag/8.3.1Release Notes, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00013.html

Timeline

Published: Jun 3, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-13756?

How severe is CVE-2020-13756?

CVE-2020-13756 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 55.08% probability of exploitation in the next 30 days.

How do I fix CVE-2020-13756?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-13756?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST