Cross-site Scripting in Parsedown
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 software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | erusev/parsedown | < 1.7.0 | 1.7.0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2018-1000162
- https://github.com/Roave/SecurityAdvisories/issues/44#issuecomment-368594409
- https://github.com/erusev/parsedown/pull/495
- https://github.com/FriendsOfPHP/security-advisories/blob/master/erusev/parsedown/CVE-2018-1000162.yaml
- https://github.com/erusev/parsedown
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- Composer
- Package
erusev/parsedown- Disclosed
- 30.03.2022
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-qgpv-86r3-87fh - CC BY 4.0
Vulnerability history: erusev/parsedown
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 03.2022 03.2022
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 1
Disclosures per year
- 2022: 2
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 0
-
Cross-site Scripting in Parsedown this entry
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.