How severe is CVE-2020-13756?

CVE-2020-13756 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-13756 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 55% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-13756?

CVE-2020-13756 affects Sabberworm Php Css Parser. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-13756?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-13756 published?

CVE-2020-13756 was published on 2020-06-03 and last updated on 2026-06-17.

CVE-2020-13756

CVE-2020-13756 is a critical-severity vulnerability in Sabberworm Php Css Parser with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 55% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 55% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Sabberworm Php Css Parser
Published: 2020-06-03
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2020-13756?: CVE-2020-13756 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-13756 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 55% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-13756?: CVE-2020-13756 affects Sabberworm Php Css Parser. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-13756?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-13756 published?: CVE-2020-13756 was published on 2020-06-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sabberworm:php_css_parser:*:*:*:*:*:*:*:*

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