What is CVE-2018-1000162?

CVE-2018-1000162 is a medium-severity vulnerability in Parsedown, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-04-18.

How severe is CVE-2018-1000162?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Parsedown

CVE-2018-1000162

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-04-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.012 (65.9th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: -0.000

Affected products

Parsedown

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/Roave/SecurityAdvisories/issues/44 (Third Party Advisory)
github.com/erusev/parsedown/pull/495 (Third Party Advisory)

Frequently asked questions

What is CVE-2018-1000162?: CVE-2018-1000162 is a medium-severity vulnerability in Parsedown, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-04-18.
How severe is CVE-2018-1000162?: Medium severity. CVSS v3 base score is 6.1 out of 10.