Is CVE-2018-20583 actively exploited?

CVE-2018-20583 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2018-20583?

CVE-2018-20583 has a CVSS score of 6.1 (MEDIUM severity). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

How do I patch CVE-2018-20583?

Patch guidance is available from thephpleague security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2018-20583.

Which products are affected by CVE-2018-20583?

1 product: thephpleague commonmark.

CVE-2018-20583 - remediation guidance & executive summary

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).

CVSS Metrics

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack Vector: network
Complexity: low
Privileges: none
User Action: required
Scope: changed
Confidentiality: low
Integrity: low
Availability: none
Weaknesses: CWE-79 · Cross-site Scripting (XSS)

Metadata

Primary Vendor: THEPHPLEAGUE
Published: 12/30/2018
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

thephpleague : commonmark

Remediation Guidance

Executive Summary

Cite this page

CVE-2018-20583. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2018-20583

View on NIST NVD

CVE-2018-20583 vulnerability