What is CVE-2019-19708?

CVE-2019-19708 is a medium-severity vulnerability in MediaWiki Visual Editor, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-12-11.

How severe is CVE-2019-19708?

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

XSS in MediaWiki Visual Editor

CVE-2019-19708

The VisualEditor extension through 1.34 for MediaWiki allows XSS via pasted content containing an element with a data-ve-clipboard-key attribute.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-12-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (53.5th percentile), scored 2026-10-26.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.5% 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

MediaWiki Visual Editor

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

phabricator.wikimedia.org/T239209 (Exploit, Vendor Advisory)
gerrit.wikimedia.org/r/q/I1f99458fd2c4f6b2460dfe7a93b330ddee4400b6 (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2019-19708?: CVE-2019-19708 is a medium-severity vulnerability in MediaWiki Visual Editor, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-12-11.
How severe is CVE-2019-19708?: Medium severity. CVSS v3 base score is 6.1 out of 10.