What is CVE-2018-19057?

CVE-2018-19057 is a medium-severity vulnerability in Sparksuite Simplemde, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-11-07.

How severe is CVE-2018-19057?

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

Is CVE-2018-19057 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Sparksuite Simplemde

CVE-2018-19057

SimpleMDE 1.11.2 has XSS via an onerror attribute of a crafted IMG element, or via certain input with [ and ( characters, which is mishandled during construction of an A element.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-11-07 · 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 (54.6th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.6% 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

Sparksuite Simplemde — versions 1.11.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

github.com/sparksuite/simplemde-markdown-editor/issues/721 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2018-19057?: CVE-2018-19057 is a medium-severity vulnerability in Sparksuite Simplemde, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-11-07.
How severe is CVE-2018-19057?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2018-19057 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.