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Cross-site Scripting in Parsedown

Moderate severity GitHub Reviewed Published Mar 30, 2022 to the GitHub Advisory Database • Updated Jul 15, 2023

Package

composer erusev/parsedown (Composer)

Affected versions

< 1.7.0

Patched versions

1.7.0

Description

Parsedown version prior to 1.7.0 contains a Cross Site Scripting (XSS) vulnerability in setMarkupEscaped for escaping HTML that can result in JavaScript code execution. This attack appears to be exploitable via specially crafted markdown that allows it to side step HTML escaping by breaking AST boundaries. This vulnerability appears to have been fixed in 1.7.0 and later.

References

Published to the GitHub Advisory Database Mar 30, 2022
Reviewed Mar 30, 2022
Last updated Jul 15, 2023

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-2018-1000162

GHSA ID

GHSA-qgpv-86r3-87fh

Source code

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