© 2026 vulntracker.io

CVE-2018-20583

N/A

Published: December 30, 2018 at 05:00 AM UTC

Updated: June 17, 2026 at 01:53 AM UTC

1 product affected across 1 vendorCommonmark

Using N/A by N/A?

Get instant alerts when new vulnerabilities affect N/A - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

N/A

Exploit prediction

EPSS 2%

Description

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Commonmark · Thephpleague

95%

0.15.6 ≤ v ≤ 0.18.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_MISCRelease NotesThird Party Advisory

Source: [email protected]

https://commonmark.thephpleague.com/changelog/

x_refsource_MISCExploitThird Party Advisory

Source: [email protected]

https://github.com/thephpleague/commonmark/issues/337

x_refsource_MISCRelease NotesThird Party Advisory

Source: [email protected]

https://github.com/thephpleague/commonmark/releases/tag/0.18.1

CVSS

4.3MEDIUM[email protected]

Confidentiality: NONE
Integrity: PARTIAL
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-79

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card