What is CVE-2019-12184?

CVE-2019-12184 is a medium-severity vulnerability in Boostio Boostnote, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2019-05-19.

How severe is CVE-2019-12184?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Boostio Boostnote

CVE-2019-12184

There is XSS in browser/components/MarkdownPreview.js in BoostIO Boostnote 0.11.15 via a label named flowchart, sequence, gallery, or chart, as demonstrated by a crafted SRC attribute of an IFRAME element, a different vulnerability than CVE-2019-12136.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-05-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.3th percentile), scored 2026-10-25.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Boostio Boostnote — versions 0.11.15

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

gist.github.com/rebirthwyw/9836b2445abd4c1358e3d68ff2415247 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-12184?: CVE-2019-12184 is a medium-severity vulnerability in Boostio Boostnote, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2019-05-19.
How severe is CVE-2019-12184?: Medium severity. CVSS v3 base score is 5.4 out of 10.