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Vulnerability record · CVE-2019-10010 · published 24 March 2019

CVE-2019-10010: Thephpleague commonmark cross-site scripting vulnerability

Thephpleague · Commonmark

Cross-site scripting (XSS) vulnerability in the PHP League CommonMark library before 0.18.3 allows remote attackers to insert unsafe links into HTML by using double-encoded HTML entities that are not properly escaped during rendering, a different vulnerability than CVE-2018-20583.

6.1 CVSS 3.0 Medium EPSS 1.1% · top 37.2% CWE-79 · Cross-site scripting
6.1CVSS 3.0 base score, v2 4.3
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Cross-site scripting (XSS) vulnerability in the PHP League CommonMark library before 0.18.3 allows remote attackers to insert unsafe links into HTML by using double-encoded HTML entities that are not properly escaped during rendering, a different vulnerability than CVE-2018-20583.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/thephpleague/commonmark/issues/353 ExploitIssue TrackingPatchThird Party Advisory
https://github.com/thephpleague/commonmark/releases/tag/0.18.3 Release NotesThird Party Advisory
https://github.com/thephpleague/commonmark/issues/353 ExploitIssue TrackingPatchThird Party Advisory
https://github.com/thephpleague/commonmark/releases/tag/0.18.3 Release NotesThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-10010), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.