What is CVE-2017-11593?

CVE-2017-11593 is a medium-severity vulnerability in Ooso Markdown Preview Plus, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2017-07-24.

How severe is CVE-2017-11593?

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

XSS in Ooso Markdown Preview Plus

CVE-2017-11593

Cross-site scripting (XSS) vulnerability in the Markdown Preview Plus extension before 0.5.7 for Chrome allows remote attackers to inject arbitrary web script or HTML into some web applications via the upload and display of crafted text, markdown, or rst files that are designed to be viewed in the browser as plain text, but that will be converted to HTML without proper sanitization.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2017-07-24 · 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: 0.008 (54.9th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Ooso Markdown Preview Plus

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/volca/markdown-preview/issues/60 (Exploit, Third Party Advisory, Issue Tracking)
github.com/volca/markdown-preview/commit/1181f044a5457d5e1ac35804ecd84e05977f19… (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2017-11593?: CVE-2017-11593 is a medium-severity vulnerability in Ooso Markdown Preview Plus, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2017-07-24.
How severe is CVE-2017-11593?: Medium severity. CVSS v3 base score is 6.1 out of 10.