CVE-2018-20583

6.1 mediumEPSS 1.9%

Medium (6.1) in thephpleague commonmark. EPSS 1.9% chance of exploitation in the next 30 days.

Cross-site scripting (XSS) vulnerability in the PHP League CommonMark library versions 0.15.6 through 0.18.x before 0.18.1 allows remote attackers to insert unsafe URLs into HTML (even if allow_unsafe_links is false) via a newline character (e.g., writing javascript as javascri%0apt).

Severity

CVSS 3.0

6.1 medium

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 1.9% chance of exploitation in the next 30 days; higher than 79% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2018-12-30
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

thephpleague:commonmark

References

https://commonmark.thephpleague.com/changelog/
https://github.com/thephpleague/commonmark/issues/337
https://github.com/thephpleague/commonmark/releases/tag/0.18.1
https://commonmark.thephpleague.com/changelog/
https://github.com/thephpleague/commonmark/issues/337

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