CVE-2018-20583: XSS
First published: Sat Dec 29 2018(Updated: )
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).
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| composer/league/commonmark | >=0.15.6<0.18.1 | |
| Thephpleague Commonmark | >=0.15.6<=0.18.0 | |
| composer/league/commonmark | >=0.15.6<0.18.1 | 0.18.1 |
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Reference Links
- https://github.com/thephpleague/commonmark/issues/337
- https://commonmark.thephpleague.com/changelog/
- https://github.com/thephpleague/commonmark/releases/tag/0.18.1
- https://nvd.nist.gov/vuln/detail/CVE-2018-20583
- https://github.com/FriendsOfPHP/security-advisories/blob/master/league/commonmark/CVE-2018-20583.yaml
- https://github.com/advisories/GHSA-qx76-c53f-5c7q (Advisory)
Frequently Asked Questions
What is CVE-2018-20583?
CVE-2018-20583 is a Cross-site scripting (XSS) vulnerability in the PHP League CommonMark library versions 0.15.6 through 0.18.x before 0.18.1.
What is the severity of CVE-2018-20583?
The severity of CVE-2018-20583 is medium with a severity value of 6.1.
How does CVE-2018-20583 affect the PHP League CommonMark library?
CVE-2018-20583 allows remote attackers to insert unsafe URLs into HTML, even if allow_unsafe_links is set to false, via a newline character.
How can I fix CVE-2018-20583?
To fix CVE-2018-20583, you need to update the PHP League CommonMark library to version 0.18.1 or later.
What is the Common Weakness Enumeration (CWE) of CVE-2018-20583?
The CWE of CVE-2018-20583 is CWE-79, which refers to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
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