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CVE-2018-20583

Good to know:

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Date: December 30, 2018

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).

Language: PHP

Severity Score

Related Resources (8)

https://github.com/thephpleague/commonmark
https://commonmark.thephpleague.com/changelog/
https://nvd.nist.gov/vuln/detail/CVE-2018-20583
https://github.com/thephpleague/commonmark/issues/337
https://github.com/FriendsOfPHP/security-advisories/blob/master/league/commonmark/CVE-2018-20583.yaml
https://github.com/thephpleague/commonmark/releases/tag/0.18.1
https://commonmark.thephpleague.com/changelog
https://www.mend.io/vulnerability-database/CVE-2018-20583

Severity Score

Weakness Type (CWE)

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-79

Top Fix

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Upgrade Version

Upgrade to version league/commonmark - 0.18.1;wordpress-phoenix/wordpress-development-toolkit - 1.0;fisharebest/webtrees - 2.0.0-alpha.5;colinodell/commonmark-php - 0.18.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): CHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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