PT-2018-15450 · Php League · Php League Commonmark Library

Austin H · Published 2018-12-30 · Updated 2022-05-14 · CVE-2018-20583

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions PHP League CommonMark library versions 0.15.6 through 0.18.x

Description The issue allows remote attackers to insert unsafe URLs into HTML, even when allow unsafe links is set to false, by utilizing a newline character. This can be achieved by writing javascript as javsacri%0apt, demonstrating the potential for malicious script injection.

Recommendations For PHP League CommonMark library versions 0.15.6 through 0.18.x, update to version 0.18.1 or later to resolve the issue.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2018-20583

GHSA-QX76-C53F-5C7Q

Affected Products

Php League Commonmark Library

References · 8

• 🔥 https://github.com/thephpleague/commonmark/issues/337 · Exploit
• 🔥 https://github.com/FriendsOfPHP/security-advisories/blob/master/league/commonmark/CVE-2018-20583.yaml · Exploit
• https://osv.dev/vulnerability/GHSA-qx76-c53f-5c7q · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2018-20583 · Security Note
• https://osv.dev/vulnerability/CVE-2018-20583 · Vendor Advisory
• https://github.com/thephpleague/commonmark · Note
• https://github.com/thephpleague/commonmark/releases/tag/0.18.1 · Note
• https://commonmark.thephpleague.com/changelog · Note