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Security Advisories: GSA_kwCzR0hTQS02Mm0zLWZjN2YtanBwOM02AA

Parsedown Class-Name Injection

Parsedown before 1.7.2, when safe mode is used and HTML markup is disabled, might allow attackers to execute arbitrary JavaScript code if a script (already running on the affected page) executes the contents of any element with a specific class. This occurs because spaces are permitted in code block infostrings, which interferes with the intended behavior of a single class name beginning with the language- substring.

Permalink: https://github.com/advisories/GHSA-62m3-fc7f-jpp8
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS02Mm0zLWZjN2YtanBwOM02AA
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: about 2 years ago
Updated: 8 months ago


CVSS Score: 8.1
CVSS vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Identifiers: GHSA-62m3-fc7f-jpp8, CVE-2019-10905
References: Repository: https://github.com/erusev/parsedown
Blast Radius: 42.4

Affected Packages

packagist:erusev/parsedown
Dependent packages: 782
Dependent repositories: 169,961
Downloads: 121,767,537 total
Affected Version Ranges: < 1.7.2
Fixed in: 1.7.2
All affected versions: 0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.1.4, 0.1.5, 0.2.0, 0.2.1, 0.3.0, 0.4.0, 0.4.1, 0.4.2, 0.4.3, 0.4.4, 0.4.5, 0.4.6, 0.4.7, 0.4.8, 0.5.0, 0.6.0, 0.7.0, 0.7.1, 0.7.2, 0.7.3, 0.7.4, 0.7.5, 0.7.6, 0.7.7, 0.8.0, 0.8.1, 0.8.2, 0.8.3, 0.9.0, 0.9.1, 0.9.2, 0.9.3, 0.9.4, 1.0.0, 1.0.1, 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 1.2.0, 1.3.0, 1.4.0, 1.4.1, 1.4.2, 1.4.3, 1.4.4, 1.4.5, 1.5.0, 1.5.1, 1.5.2, 1.5.3, 1.5.4, 1.6.0, 1.6.1, 1.6.2, 1.6.3, 1.6.4, 1.7.0, 1.7.1
All unaffected versions: 1.7.2, 1.7.3, 1.7.4