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PHP League CommonMark vulnerable to Cross-Site Scripting (XSS)

Moderate severity GitHub Reviewed Published May 14, 2022 to the GitHub Advisory Database • Updated Feb 6, 2024

Package

composer league/commonmark (Composer)

Affected versions

>= 0.15.6, < 0.18.1

Patched versions

0.18.1

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).

References

Published by the National Vulnerability Database Dec 30, 2018
Published to the GitHub Advisory Database May 14, 2022
Reviewed Sep 12, 2022
Last updated Feb 6, 2024

Severity

Moderate
6.1
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weaknesses

CVE ID

CVE-2018-20583

GHSA ID

GHSA-qx76-c53f-5c7q

Source code

Credits

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