CVE-2018-1000162

Severity: medium (CVSS 6.1 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-04-18 · updated 2026-06-17
Weakness: CWE-79

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.

Affected products

Parsedown: before 1.7.0 — fixed in 1.7.0

How to fix

Upgrade to a fixed version: Parsedown 1.7.0. Check the vendor advisory for mitigations.

References

https://github.com/Roave/SecurityAdvisories/issues/44#issuecomment-368594409
https://github.com/erusev/parsedown/pull/495
https://github.com/Roave/SecurityAdvisories/issues/44#issuecomment-368594409
https://github.com/erusev/parsedown/pull/495

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