Vulnerability · Published Jun 3, 2020 · Assigned by mitre
CVE-2020-13756
Critical 9.8
In plain English
A critical-severity security flaw in the php-horde-css-parser package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 49.8% (higher than 99% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)49.8%top 1.1% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack tooling1Public PoC
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | php-horde-css-parser | no fix listed | DEBIAN-CVE-2020-13756 |
| Packagist | sabberworm/php-css-parser | 8.2.1 | GHSA-phrq-v4q2-hmq6 |
| Packagist | sabberworm/php-css-parser | 8.1.1 | GHSA-phrq-v4q2-hmq6 |
| Packagist | sabberworm/php-css-parser | 8.0.1 | GHSA-phrq-v4q2-hmq6 |
| Packagist | sabberworm/php-css-parser | 7.0.4 | GHSA-phrq-v4q2-hmq6 |
| Packagist | sabberworm/php-css-parser | 6.0.2 | GHSA-phrq-v4q2-hmq6 |
| Packagist | sabberworm/php-css-parser | 5.2.1 | GHSA-phrq-v4q2-hmq6 |
| Packagist | sabberworm/php-css-parser | 8.3.1 | GHSA-phrq-v4q2-hmq6 |
| Packagist | sabberworm/php-css-parser | 5.0.9 | GHSA-phrq-v4q2-hmq6 |
| Packagist | sabberworm/php-css-parser | 4.0.1 | GHSA-phrq-v4q2-hmq6 |
| Packagist | sabberworm/php-css-parser | 3.0.1 | GHSA-phrq-v4q2-hmq6 |
| Packagist | sabberworm/php-css-parser | 2.0.1 | GHSA-phrq-v4q2-hmq6 |
| Packagist | sabberworm/php-css-parser | 1.0.1 | GHSA-phrq-v4q2-hmq6 |
| Packagist | sabberworm/php-css-parser | 5.1.3 | GHSA-phrq-v4q2-hmq6 |
Affected products (as reported)
References
- https://github.com/sabberworm/PHP-CSS-Parser/commit/2ebf59e8bfbf6cfc1653a5f0ed743b95062c62a4 x_refsource_MISC
- https://github.com/sabberworm/PHP-CSS-Parser/releases/tag/8.3.1 x_refsource_MISC
- http://seclists.org/fulldisclosure/2020/Jun/7 x_refsource_MISC
- http://packetstormsecurity.com/files/157923/Sabberworm-PHP-CSS-Code-Injection.html x_refsource_MISC
- https://lists.debian.org/debian-lts-announce/2025/10/msg00013.html